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    <element id="VYST_IncomeTaxReconciliationNondeductibleExpenseDerivativeDebtDiscount" name="IncomeTaxReconciliationNondeductibleExpenseDerivativeDebtDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDerivativeDebtDiscount" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDerivativeDebtDiscount" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_EffectiveIncomeTaxRateReconciliationInterestAccruedToCashBasisTaxpayers" name="EffectiveIncomeTaxRateReconciliationInterestAccruedToCashBasisTaxpayers" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_EffectiveIncomeTaxRateReconciliationInterestAccruedToCashBasisTaxpayersPercent" name="EffectiveIncomeTaxRateReconciliationInterestAccruedToCashBasisTaxpayersPercent" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_IncomeTaxReconciliationChangeInReserves" name="IncomeTaxReconciliationChangeInReserves" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_EffectiveIncomeTaxRateReconciliationChangeInReservesPercent" name="EffectiveIncomeTaxRateReconciliationChangeInReservesPercent" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_AdditionsChargedToIncomeTaxBenefit" name="AdditionsChargedToIncomeTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_GainsLossesOnSettlementOfDebtNet" name="GainsLossesOnSettlementOfDebtNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_ReductionInObsolescenceReserve" name="ReductionInObsolescenceReserve" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_WorkingCapitalAdvances" name="WorkingCapitalAdvances" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_PurchaseMember" name="PurchaseMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="VYST_OneMajorVendorMember" name="OneMajorVendorMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
</schema>