| '10 Å Phase' | Mg, Si, O, H |
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| Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
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| 'Actinolite Root Name Group' | ◻Ca2(Mg0-4.5M2+0.5-5)Si8O22(OH,F,Cl)2 |
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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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| 'Al-Antigorite' | Mg3((Si,Al)2O5)(OH)4 |
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| 'Al-lizardite' | Mg3((Si,Al)2O5)(OH)4 |
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| Aliettite | Ca0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O |
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| 'Alipite' | (Ni,Mg)3Si4O10(OH)2 · nH2O |
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| 'Allophite' | Mg8Al4Si5O24 · H2O |
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| 'Aloisiite' | Na2(Ca,Fe,Mg)5Si2O10 · 2H2O |
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| Alpeite | Ca4Mn23+Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6 |
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| 'Aluminium-glauconite' | (K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2 |
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| 'Aluminium-saponite' | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
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| 'Aluminium-sepiolite' | Mg4(Si6O15)(OH)2 · 6H2O |
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| 'Alumino-ottoliniite' | ◻NaLi(Mg3Al2)Si8O22(OH)2 |
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| Aluminoceladonite | K(MgAl◻)(Si4O10)(OH)2 |
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| 'Aluminum Tosudite' | Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O |
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| 'Alumodeweylite' | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
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| Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
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| 'Alushtite' | Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O |
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| Amesite | Mg2Al(AlSiO5)(OH)4 |
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| 'Amesite-2H1' | (Mg2Al)(SiAl)O5(OH)4 |
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| Anandite | (Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2 |
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| 'Andes Jade' | Mg3(Si2O5)(OH)4 |
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| 'Anophorite' | {Na}{Na,Ca}2{Mg,Fe3+,Ti}5(Si8O22)(OH)2 |
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| Anthophyllite | ◻{Mg2}{Mg5}(Si8O22)(OH)2 |
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| Antigorite | Mg3(Si2O5)(OH)4 |
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| 'Aphrosiderite' | (Fe,Mg,Al)6(Si,Al)4O10(OH)8 |
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| 'Aquacreptite (of Harada)' | Mg3Si4O10 · 5H2O or near |
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| 'Aquacreptite (of Shepard)' | Mg4Fe2Si6O19 · 8H2O with some Al2O3, or near |
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| 'Arctolite' | near (Ca,Mg)Al2Si3O10 · H2O |
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| Ardennite-(As) | Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 |
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| 'Ardennite-(Si)' | ~Mn42+Al4(AlMg)(SiO4,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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| Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 |
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| 'Askanite' | (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O |
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| Aspidolite | NaMg3(AlSi3O10)(OH)2 |
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| 'Asteroite' | (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
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| 'Astochite' | {Na}{Na(Ca,Mn)}{Mg5}(Si8O22)(OH)2 |
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| 'Atheriastite' | near Ca5MgFeAl6Si8O32 · 5H2O |
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| Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
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| Axinite-(Mg) | Ca2MgAl2BSi4O15OH |
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| 'Baikalite' | CaMgSi2O6 |
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| Baileychlore | (Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8 |
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| Balangeroite | (Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40 |
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| Balipholite | BaLiMg2Al3(Si2O6)2(OH)4 |
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