| ' Unnamed (Lanthanum Oxyfluoride)' | (La,Ce)OF3 |
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| '"Herkimer-style" Quartz' | SiO2 |
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| ''Unnamed (Monoclinic Phase-II Cristobalite)'' | SiO2 |
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| '(Nb,Fe)-substituted anatase' | (Ti0.5Nb0.25)Σ1.00O2 |
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| '10 Å Phase' | Mg, Si, O, H |
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| Abellaite | NaPb2(CO3)2(OH) |
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| Abenakiite-(Ce) | Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O |
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| Abernathyite | K(UO2)(AsO4) · 3H2O |
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| Abhurite | Sn21Cl16(OH)14O6 |
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| 'Absite' | Ti7U2ThO20 · 5H2O or close |
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| Abswurmbachite | CuMn63+(SiO4)O8 |
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| Abuite | CaAl2(PO4)2F2 |
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| 'Acarbodavyne' | (Na,Ca,K)8(Si6Al6)O24(Cl,SO4)2-3
|
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| Acetamide | CH3CONH2 |
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| Achalaite | (Fe2+,Mn)(Ti,Fe3+,Ta)(Nb,Ta)2O8 |
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| 'Achroite' | A(D3)G6(T6O18)(BO3)3X3Z |
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| Achyrophanite | (K,Na)3(Fe3+,Ti,Al,Mg)5O2(AsO4)5 |
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| 'Aciculite' | CaFe2O4 |
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| Acmonidesite | (NH4,K,Pb)8NaFe42+(SO4)5Cl8 |
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| Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22OH2 |
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| Acuminite | Sr[AlF4(OH)(H2O)] |
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| Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) |
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| 'Adamantine Spar' | Al2O3 |
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| Adamite | Zn2(AsO4)(OH) |
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| 'Adamsite' | KAl2(AlSi3O10)(OH)2 |
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| Adamsite-(Y) | NaY[CO3]2 · 6H2O |
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| Adanite | Pb2(Te4+O3)(SO4) |
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| Addibischoffite | Ca2Al6Al6O20 |
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| Adelite | CaMg(AsO4)(OH) |
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| 'Adlerstein' | FeO(OH) · nH2O |
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| Admontite | MgB6O10 · 7H2O |
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| Adolfpateraite | K(UO2)(SO4)(OH)(H2O) |
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| Adranosite | (NH4)4NaAl2(SO4)4Cl(OH)2 |
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| Adranosite-(Fe) | (NH4)4NaFe23+(SO4)4Cl(OH)2 |
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| Adrianite | Ca12(Al4Mg3Si7)O32Cl6 |
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| 'Adularia' | KAlSi3O8 |
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| Aegirine | NaFe3+Si2O6 |
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| Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
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| Aenigmatite | Na4[Fe102+Ti2]O4[Si12O36] |
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| Aerinite | (Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12] |
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| 'Aeroides' | Be3Al2(Si6O18) |
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| Aerugite | Ni8.5(AsO4)2As5+O8 |
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| 'Aeschynite Group' | AD2O6 |
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| Aeschynite-(Ce) | (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 |
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| Aeschynite-(Nd) | (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6 |
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| Aeschynite-(Y) | (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6 |
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| 'Afanasievaite' | Ca8(Si2O7)2Cl2O |
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| 'Afanasyevaite' | Ca8[Si2O7]OCl2 |
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| Afghanite | (Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6 |
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| Afmite | Al3(OH)4(H2O)3(PO4)(PO3OH) · H2O |
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