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  <xs:element id="hwkn_WaterTreatmentMember" abstract="true" name="WaterTreatmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hwkn_ManufacturedBlendedOrRepackagedProductsMember" abstract="true" name="ManufacturedBlendedOrRepackagedProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hwkn_BulkProductsMember" abstract="true" name="BulkProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="hwkn_NumberOfOperatingSegmentsAggregated" abstract="false" name="NumberOfOperatingSegmentsAggregated" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="hwkn_Totaldebtnetofdebtissuancecosts" abstract="false" name="Totaldebtnetofdebtissuancecosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="hwkn_WaterAndWasteSpecialtiesIncMember" abstract="true" name="WaterAndWasteSpecialtiesIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
