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  <xsd:element name="NumberOfSharesIssuableUnderStockOptionsAwardedDuringPeriod" id="agx_NumberOfSharesIssuableUnderStockOptionsAwardedDuringPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <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="AdditionsToIntangibleAssets" id="agx_AdditionsToIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <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="O2027Q1DividendsMember" id="agx_O2027Q1DividendsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
