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  <xsd:element id="agx_TradeAndOtherReceivablesDisclosureTextBlock" name="TradeAndOtherReceivablesDisclosureTextBlock" nillable="true" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_InvestmentMaturityPeriod" name="InvestmentMaturityPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOther" name="DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOther" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="agx_CommitmentDisclosureAbstract" name="CommitmentDisclosureAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
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  <xsd:element id="agx_CommitmentsLineItems" name="CommitmentsLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeriodForMonthlyClosingPrices" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeriodForMonthlyClosingPrices" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_PeriodOfAmortizationOfGoodwillForIncomeTaxPurpose" name="PeriodOfAmortizationOfGoodwillForIncomeTaxPurpose" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_ProjectDevelopmentServicesMember" name="ProjectDevelopmentServicesMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_MajorCustomerFourMember" name="MajorCustomerFourMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_WarrantyPeriodForConstructionContracts" name="WarrantyPeriodForConstructionContracts" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_PercentageReductionInAggregateFairValueOfStockOption" name="PercentageReductionInAggregateFairValueOfStockOption" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_AdditionsToOtherIntangibleAssets" name="AdditionsToOtherIntangibleAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="agx_RetainedAmountUnderConstructionContracts" name="RetainedAmountUnderConstructionContracts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="agx_PerformanceBasedRestrictedStockUnitsMember" name="PerformanceBasedRestrictedStockUnitsMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_IncomeTaxRefundsAndPrepaidIncomeTaxes" name="IncomeTaxRefundsAndPrepaidIncomeTaxes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" abstract="false" />
  <xsd:element id="agx_OperatingLeaseAndShortTermRentalAgreementsExpense" name="OperatingLeaseAndShortTermRentalAgreementsExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="agx_IncreaseInLossCarrybackPeriodForCertainLosses" name="IncreaseInLossCarrybackPeriodForCertainLosses" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_NPricedChangeOrdersIncludedInTransactionPrices" name="NPricedChangeOrdersIncludedInTransactionPrices" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element id="agx_Plan2020Member" name="Plan2020Member" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_PercentageOfMaximumSharesForTargetNumberOfSharesAwarded" name="PercentageOfMaximumSharesForTargetNumberOfSharesAwarded" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExcessExecutiveCompensationAmount" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExcessExecutiveCompensationAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="agx_DeferredTaxAssetsLeaseLiabilities" name="DeferredTaxAssetsLeaseLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <xsd:element id="agx_DeferredTaxLiabilitiesRightOfUseAssets" name="DeferredTaxLiabilitiesRightOfUseAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="agx_LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity" name="LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="agx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriodWeightedAverageGrantDateFairValue" nillable="true" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="agx_RenewablePerformanceBasedRestrictedStockUnitsMember" name="RenewablePerformanceBasedRestrictedStockUnitsMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_TimeBasedRestrictedStockUnitsMember" name="TimeBasedRestrictedStockUnitsMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="agx_RemainingBondedPerformanceObligations" name="RemainingBondedPerformanceObligations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="agx_CashInvestmentCommitments" name="CashInvestmentCommitments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element name="InitialApplicationsPeriodCumulativeEffectTransitionAxis" id="agx_InitialApplicationsPeriodCumulativeEffectTransitionAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="InitialApplicationsPeriodCumulativeEffectTransitionDomain" id="agx_InitialApplicationsPeriodCumulativeEffectTransitionDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DeferredTaxAssetsDeferredResearchAndDevelopmentCost" id="agx_DeferredTaxAssetsDeferredResearchAndDevelopmentCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="OperatingLeaseRightOfUseAssetAndOtherAssets" id="agx_OperatingLeaseRightOfUseAssetAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AccruedProjectCostsCurrent" id="agx_AccruedProjectCostsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AccruedLeaseLiabilitiesCurrent" id="agx_AccruedLeaseLiabilitiesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="UnrecognizedTaxBenefitsDecreaseResultingFromResearchAndDevelopmentTaxCredit" id="agx_UnrecognizedTaxBenefitsDecreaseResultingFromResearchAndDevelopmentTaxCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SupplementalFinancialStatementInformationAbstract" id="agx_SupplementalFinancialStatementInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FraudulentlyInducedPaymentMember" id="agx_FraudulentlyInducedPaymentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AvailableForSaleSecuritiesPolicyTextBlock" id="agx_AvailableForSaleSecuritiesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TreasuryStockPolicyTextBlock" id="agx_TreasuryStockPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="AccruedInvestmentIncomeDividendReceivable" id="agx_AccruedInvestmentIncomeDividendReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EarningsPerSharePerformanceBasedRestrictedStockUnitsMember" id="agx_EarningsPerSharePerformanceBasedRestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TreasuryStockSettlementOfStockOptionExercisesAndOtherShareBasedAwards" id="agx_TreasuryStockSettlementOfStockOptionExercisesAndOtherShareBasedAwards" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="IndustrialConstructionServicesMember" id="agx_IndustrialConstructionServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="OperatingLeasesPaid" id="agx_OperatingLeasesPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="EstimatedLoss" id="agx_EstimatedLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EstimatedLossIncludingReversalOfNetGrossProfitRecordedInPreviousYears" id="agx_EstimatedLossIncludingReversalOfNetGrossProfitRecordedInPreviousYears" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PercentageIncreaseInCommonStockDividendPerShare" id="agx_PercentageIncreaseInCommonStockDividendPerShare" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="ShareBasedPaymentArrangementAveragePricePerShareOfSharesWithheldForTaxWithholdingObligation" id="agx_ShareBasedPaymentArrangementAveragePricePerShareOfSharesWithheldForTaxWithholdingObligation" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ScheduleOfLeaseTermAndDiscountRatesOfOperatingLeasesOfLesseeTableTextBlock" id="agx_ScheduleOfLeaseTermAndDiscountRatesOfOperatingLeasesOfLesseeTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue" id="agx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationAdjustmentsToValuationsForForeignNolsAmount" id="agx_EffectiveIncomeTaxRateReconciliationAdjustmentsToValuationsForForeignNolsAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="AmortizationOfEquityInvestmentsInSolarEnergyProjects" id="agx_AmortizationOfEquityInvestmentsInSolarEnergyProjects" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="InvestmentsCommittedButNotYetPaid" id="agx_InvestmentsCommittedButNotYetPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearWithinOneYear" id="agx_DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearWithinOneYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleFairValueMaturityAllocatedAndSingleMaturityDateYearWithinOneYear" id="agx_DebtSecuritiesAvailableForSaleFairValueMaturityAllocatedAndSingleMaturityDateYearWithinOneYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxAfterWithinOneYear" id="agx_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxAfterWithinOneYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ProceedsFromShareBasedAwardSettlementsNetOfWithholdingTaxesPaid" id="agx_ProceedsFromShareBasedAwardSettlementsNetOfWithholdingTaxesPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxWithinOneYear" id="agx_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxWithinOneYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ExpiresOnMay312027Member" id="agx_ExpiresOnMay312027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOneToThree" id="agx_DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearOneToThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearThreeToFive" id="agx_DebtSecuritiesAvailableForSaleAmortizedCostMaturityAllocatedAndSingleMaturityDateYearThreeToFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxAfterYearOneThroughThree" id="agx_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxAfterYearOneThroughThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxAfterYearThreeThroughFive" id="agx_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainBeforeTaxAfterYearThreeThroughFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxAfterYearOneThroughThree" id="agx_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxAfterYearOneThroughThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxAfterYearThreeThroughFive" id="agx_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossBeforeTaxAfterYearThreeThroughFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleFairValueMaturityAllocatedAndSingleMaturityDateYearOneToThree" id="agx_DebtSecuritiesAvailableForSaleFairValueMaturityAllocatedAndSingleMaturityDateYearOneToThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtSecuritiesAvailableForSaleFairValueMaturityAllocatedAndSingleMaturityDateYearThreeToFive" id="agx_DebtSecuritiesAvailableForSaleFairValueMaturityAllocatedAndSingleMaturityDateYearThreeToFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TelecommunicationInfrastructureServicesMember" id="agx_TelecommunicationInfrastructureServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2024Q1DividendsMember" id="agx_O2024Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2024Q2DividendsMember" id="agx_O2024Q2DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="StockRepurchasedIncludingExciseTaxDuringPeriodValue" id="agx_StockRepurchasedIncludingExciseTaxDuringPeriodValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationDeductionShareBasedCompensationWindfall" id="agx_EffectiveIncomeTaxRateReconciliationDeductionShareBasedCompensationWindfall" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="BillableContractsReceivables" id="agx_BillableContractsReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="OverseasProjectMember" id="agx_OverseasProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2025Q3DividendsMember" id="agx_O2025Q3DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2025Q2DividendsMember" id="agx_O2025Q2DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2025Q1DividendsMember" id="agx_O2025Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2024Q4DividendsMember" id="agx_O2024Q4DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2024Q3DividendsMember" id="agx_O2024Q3DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="InvestmentInTaxCreditEntitiesPolicyPolicyTextBlock" id="agx_InvestmentInTaxCreditEntitiesPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="O2025Q4DividendsMember" id="agx_O2025Q4DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="WeightedAverageAnnualYieldOnOutstandingInvestedFundsAndInterestBearingCashAccountBalances" id="agx_WeightedAverageAnnualYieldOnOutstandingInvestedFundsAndInterestBearingCashAccountBalances" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="AtlanticProjectsCompanyUkLimitedMember" id="agx_AtlanticProjectsCompanyUkLimitedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="InvestmentsInSolarTaxCreditEntitiesMember" id="agx_InvestmentsInSolarTaxCreditEntitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="InvestmentsInSolarTaxCreditEntitiesQualifyForPamMember" id="agx_InvestmentsInSolarTaxCreditEntitiesQualifyForPamMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="InvestmentsInSolarTaxCreditEntitiesDoNotQualifyForPamMember" id="agx_InvestmentsInSolarTaxCreditEntitiesDoNotQualifyForPamMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NoteReceivableCurrent" id="agx_NoteReceivableCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="IncomeTaxCreditsOfEquityInvestmentsInSolarEnergyProjects" id="agx_IncomeTaxCreditsOfEquityInvestmentsInSolarEnergyProjects" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LetterOfCreditAmount" id="agx_LetterOfCreditAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="O2026Q1DividendsMember" id="agx_O2026Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ShareRepurchaseProgramAuthorizedAmountIncrease" id="agx_ShareRepurchaseProgramAuthorizedAmountIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LiabilitiesNoncurrentExcludingDeferredTaxLiability" id="agx_LiabilitiesNoncurrentExcludingDeferredTaxLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="Numberofsharesissuableunderrestrictedstocksunitsawardedduringperiod" id="agx_Numberofsharesissuableunderrestrictedstocksunitsawardedduringperiod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PercentageOfCashAndCashEquivalentsAndInvestmentsHeldByForeignSubsidiaries" id="agx_PercentageOfCashAndCashEquivalentsAndInvestmentsHeldByForeignSubsidiaries" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="O2026Q2DividendsMember" id="agx_O2026Q2DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="O2026Q3DividendsMember" id="agx_O2026Q3DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AverageSharePrice" id="agx_AverageSharePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="O2026Q4DividendsMember" id="agx_O2026Q4DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ShippingAndHandlingCostExpensesPolicyPolicyTextBlock" id="agx_ShippingAndHandlingCostExpensesPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DefinedContributionPlanNonQualifiedPlanDeferralPeriodByEmployerElection" id="agx_DefinedContributionPlanNonQualifiedPlanDeferralPeriodByEmployerElection" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DefinedContributionPlanNonQualifiedPlanDeferralPeriodByEmployeeElection" id="agx_DefinedContributionPlanNonQualifiedPlanDeferralPeriodByEmployeeElection" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExcessExecutiveCompensationPercent" id="agx_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExcessExecutiveCompensationPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="IncomeTaxPaymentsMadeForSolarTaxCreditInvestments" id="agx_IncomeTaxPaymentsMadeForSolarTaxCreditInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="IncomeTaxReconciliationTaxExemptIncomeOrNondeductibleExpenseOther" id="agx_IncomeTaxReconciliationTaxExemptIncomeOrNondeductibleExpenseOther" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationTaxExemptIncomeOrNondeductibleExpenseOther" id="agx_EffectiveIncomeTaxRateReconciliationTaxExemptIncomeOrNondeductibleExpenseOther" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationShareBasedCompensationWindfall" id="agx_EffectiveIncomeTaxRateReconciliationShareBasedCompensationWindfall" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationTaxCreditInvestments" id="agx_EffectiveIncomeTaxRateReconciliationTaxCreditInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationsCrossBorderTaxEffectPercent" id="agx_EffectiveIncomeTaxRateReconciliationsCrossBorderTaxEffectPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="UnrecognizedTaxBenefitContractAssets" id="agx_UnrecognizedTaxBenefitContractAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
</xsd:schema>
