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      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
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        <Desc>MINERAL DISPLAYS</Desc>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>-42389</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>-42389</RevenueNotReportedAmt>
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      <InvestmentExpensesNotIncldAmt>42993</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>42993</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>5344231</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>5832336</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>5832336</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>42993</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>42993</ExpensesNotRptFinclStmtAmt>
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        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>A COLLECTION OF MINERALS, ROCK SAMPLES AND FOSSILS FROM AROUND THE WORLD. THE SAMPLES ARE USED TO ENCOURAGE INTEREST IN THE GEOSCIENCES, ESPECIALLY IN MINERALS AND FOSSILS, FOR VISITORS THAT TOUR THE AGI BUILDING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>AGI HAS A FLEXIBLE POLICY TO BALANCE THE SHORTER-TERM GRANT-MAKING OBLIGATIONS WITH AGI'S GOAL OF PROVIDING GRANTS INTO PERPETUITY. IN ESTABLISHING THIS POLICY, THE BOARD OF DIRECTORS CONSIDERED THE LONG -TERM EXPECTED RETURN ON THE ENDOWMENT, COUPLED WITH THE ABILITY TO ENDURE PERIODS OF UNDERPERFORMANCE WITHOUT EXCESSIVE DETERIORATION OF REAL PRINCIPAL. ACCORDINGLY, OVER THE LONG TERM, AGI EXPECTS THE CURRENT FLEXIBLE SPENDING POLICY TO ALLOW ITS ENDOWMENT TO GROW AT LEAST AT THE RATE OF INFLATION. THIS IS CONSISTENT WITH AGI'S OBJECTIVE TO MAINTAIN THE PURCHASING POWER OF THE ENDOWMENT ASSETS HELD IN PERPETUITY AS WELL AS TO PROVIDE ADDITIONAL REAL GROWTH THROUGH NEW GIFTS AND INVESTMENT RETURN.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>AGI IS EXEMPT FROM FEDERAL INCOME TAX AS A NONPROFIT ORGANIZATION DESCRIBED IN SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE AND IS CLASSIFIED AS AN ORGANIZATION OTHER THAN A PRIVATE FOUNDATION. INCOME FROM ADVERTISING IS SUBJECT TO UNRELATED BUSINESS INCOME TAX. FOR THE YEARS ENDED SEPTEMBER 30, 2025 AND 2024, ALLOCABLE EXPENSES EXCEED THE INCOME EARNED. ACCORDINGLY, NO PROVISION FOR INCOME TAXES HAS BEEN MADE IN THE ACCOMPANYING FINANCIAL STATEMENTS. AGI PERFORMED AN EVALUATION OF UNCERTAINTY IN INCOME TAXES FOR THE YEAR ENDED SEPTEMBER 30, 2025 AND 2024, AND DETERMINED THAT THERE WERE NO MATTERS THAT WOULD REQUIRE RECOGNITION IN THE CONSOLIDATED FINANCIAL STATEMENTS OR THAT MAY HAVE ANY EFFECT ON ITS TAX-EXEMPT STATUS. AS OF SEPTEMBER 30, 2025 AND 2024, TAX RETURNS REMAINED OPEN FOR CERTAIN YEARS WITH THE U.S. FEDERAL JURISDICTION OR THE VARIOUS STATES AND LOCAL JURISDICTIONS IN WHICH AGI FILES TAX RETURNS; HOWEVER, THERE ARE CURRENTLY NO EXAMINATIONS PENDING OR IN PROCESS. IT IS AGI'S POLICY TO RECOGNIZE INTEREST AND/OR PENALTIES RELATED TO UNCERTAINTY IN INCOME TAXES, IF ANY, IN INTEREST OR INCOME TAX EXPENSE.</ExplanationTxt>
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        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>PROGRAM SERVICES</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>ACTIVITIES IN GERMANY, TO FURTHER THE MISSION, MORE THAN $10,000 IN PROGRAM SERVICE REVENUE.</SpecificServicesProvidedTxt>
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      </AccountActivitiesOutsideUSGrp>
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      <ContinuationTotalEmployeeCnt>0</ContinuationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <SubtotalSpentAmt>38610</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>38610</TotalSpentAmt>
      <TransferToForeignCorpInd>0</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>0</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>0</ForeignPartnershipInd>
      <BoycottCountriesInd>0</BoycottCountriesInd>
    </IRS990ScheduleF>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <PersonNm>GEOFFREY CAMPHIRE</PersonNm>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>A COMPENSATION STUDY WAS CONDUCTED ON JUNE 1, 2025.</ExplanationTxt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ANY SOCIETY OF NATIONAL OR INTERNATIONAL SCOPE CONCERNED WITH ANY OF THE EARTH SCIENCES, THE OBJECTIVES OF WHICH ARE IN KEEPING WITH THE PURPOSES OF THE AMERICAN GEOSCIENCES INSTITUTE, SHALL BE ELIGIBLE TO BECOME A MEMBER SOCIETY UPON MEETING CONDITIONS PRESCRIBED IN THE BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBER SOCIETY COUNCIL IS THE REPRESENTATIVE BODY OF THE INSTITUTE'S MEMBER SOCIETIES. THE COUNCIL SHALL HAVE RESPONSIBILITY FOR NOMINATING AND ELECTING THE OFFICERS OF THE INSTITUTE AND THE VOTING MEMBERS OF THE EXECUTIVE COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CONSTITUTION OF THE INSTITUTE MAY BE AMENDED BY TWO THIRDS OF THE TOTAL VOTES OF THE MEMBER-SOCIETY COUNCIL, BUT SUCH AMENDMENTS SHALL NOT BECOME EFFECTIVE UNTIL RATIFIED BY THE GOVERNING BODIES OF THE MAJORITY OF THE MEMBER SOCIETIES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DRAFT FORM 990 IS REVIEWED BY THE CONTROLLER AND EXECUTIVE DIRECTOR PRIOR TO FILING WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, MEMBERS OF THE BOARD ARE ASKED TO DISCLOSE ANY CONFLICTS OF INTEREST THEY MAY HAVE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR THE EXECUTIVE DIRECTOR IS DETERMINED BY A COMPENSATION COMMITTEE AND DOCUMENTED IN A CONTRACT. COMPENSATION OF OTHER KEY EMPLOYEES IS DETERMINED BY THE EXECUTIVE DIRECTOR AND REVIEWED BY THE COMPENSATION COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES THESE DOCUMENTS AVAILABLE TO THE PUBLIC UPON REQUEST. THE ANNUAL REPORT AND BYLAWS ARE AVAILABLE ON THE WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
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</Return>