| Achyrophanite | (K,Na)3(Fe3+,Ti,Al,Mg)5O2(AsO4)5 |
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| Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
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| Adelite | CaMg(AsO4)(OH) |
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| Admontite | MgB6O10 · 7H2O |
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| Adrianite | Ca12(Al4Mg3Si7)O32Cl6 |
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| Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
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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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| Åkermanite | Ca2Mg[Si2O7] |
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| Akimotoite | (Mg,Fe2+)SiO3 |
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| Akrochordite | (Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O |
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| Aksaite | Mg[B6O7(OH)6] · 2H2O |
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| Albrechtschraufite | Ca4Mg(UO2)2(CO3)6F2 · 17-18H2O |
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| Aldermanite | [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6] · H2O |
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| Aliettite | Ca0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O |
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| Alluaudite | (Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3 |
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| Alpeite | Ca4Mn23+Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6 |
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| Alpersite | (Mg,Cu)(SO4) · 7H2O |
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| Althausite | Mg4(PO4)2(OH,O)(F,◻) |
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| Aluminoceladonite | K(MgAl◻)(Si4O10)(OH)2 |
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| Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
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| Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
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| Amesite | Mg2Al(AlSiO5)(OH)4 |
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| Ammoniolasalite | (NH4)2Mg2(H2O)20] [V10O28] |
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| Ammoniomagnesiovoltaite | (NH4)2Mg52+Fe33+Al(SO4)12 · 18H2O |
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| Anandite | (Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2 |
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| Anatolyite | Na6(Ca,Na)(Mg,Fe3+)3Al(AsO4)6 |
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| Angastonite | CaMgAl2(PO4)2(OH)4 · 7H2O |
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| Anhydrokainite | KMg(SO4)Cl |
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| Ankerite | Ca(Fe2+,Mg)(CO3)2 |
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| Anthophyllite | ◻{Mg2}{Mg5}(Si8O22)(OH)2 |
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| Antigorite | Mg3(Si2O5)(OH)4 |
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| Apexite | NaMg(PO4) · 9H2O |
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| Arakiite | (Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23 |
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| Ardennite-(As) | Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 |
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| Ardennite-(V) | Mn42+Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
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| Arhbarite | Cu2Mg(AsO4)(OH)3 |
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| Aristarainite | Na2MgB12O20 · 8H2O |
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| Armalcolite | (Mg,Fe2+)Ti2O5 |
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| Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 |
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| Arsenowagnerite | Mg2(AsO4)F |
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| Arsenudinaite | NaMg4(AsO4)3 |
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| Artinite | Mg2(CO3)(OH)2 · 3H2O |
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| Aspidolite | NaMg3(AlSi3O10)(OH)2 |
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| Atencioite | Ca2Fe32+Mg2Be4(PO4)6(OH)4 · 6H2O |
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| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
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| Axinite-(Mg) | Ca2MgAl2BSi4O15OH |
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| Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
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| Badalovite | Na2Mg2Fe(AsO4)3 |
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| Baileychlore | (Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8 |
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| Bakhchisaraitsevite | Na2Mg5(PO4)4 · 7H2O |
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