| 'Sobotkite' | (K,Ca0.5)0.33(Mg0.66Al0.33)3(Si3Al)O10(OH)2 · 1-5H2O |
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| 'Sodium-Calcium Amphibole Subgroup' | An(NaCa)(Z2+5-mZm3+)(Si8-(n+m+1)Al(n+m-1)O22)(OH,F,Cl)2 |
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| Spurrite | Ca5(SiO4)2(CO3) |
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| 'Stannoan Grossular' | (Ca,Sn)3Al2(SiO4)3 |
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| Stavelotite-(La) | (La,Nd,Ca)3Mn32+Cu(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30 |
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| Steacyite | K0.3(Na,Ca)2ThSi8O20 |
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| Stellerite | Ca4(Si28Al8)O72 · 28H2O |
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| Steudelite | Na3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2O |
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| Stevensite | (Ca,Na)xMg3-x(Si4O10)(OH)2 |
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| Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
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| Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 |
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| Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
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| Stöfflerite | CaAl2Si2O8 |
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| Stokesite | CaSn[Si3O9] · 2H2O |
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| Stracherite | BaCa6(SiO4)2[(PO4)(CO3)]2F |
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| Strätlingite | Ca2Al2SiO7 · 8H2O |
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| Stringhamite | CaCu(SiO4) · H2O |
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| Strontiochevkinite | (Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8 |
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| 'Strontium Perrierite' | (Ce,Sr,La,Ca)4Fe2+(Ti,Zr,Fe)2Ti2(Si2O7)2O8 |
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| 'Strontium-bearing Piemontite' | {(Ca,Sr)2}{Al2Mn3+}(Si2O7)(SiO4)O(OH) |
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| 'Strontium-bearing Potassic-richterite' | K[(Ca,Sr)Na][Mg5]Si8O22(OH)2 |
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| 'Strontium-bearing Thomsonite' | Na(Ca,Sr)2[Al5Si5O20] · 6H2O |
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| Sulfhydrylbystrite | Na5K2Ca[Al6Si6O24](S5)2(SH) |
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| 'Sulfite-rich thaumasite' | Ca3(SO4)[Si(OH)6](CO3) · 12H2O |
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| Suolunite | Ca2(H2Si2O7) · H2O |
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| Surite | (Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2 |
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| Sveinbergeite | Ca(Fe62+Fe3+)Ti2(Si4O12)2O2(OH)5(H2O)4 |
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| Svyatoslavite | Ca(Al2Si2O8) |
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| Tacharanite | Ca12Al2Si18O33 (OH)36 |
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| Tadzhikite-(Ce) | Ca4Ce23+Ti◻2(B4Si4O22)(OH)2 |
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| Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
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| Tamaite | (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O |
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| Taneyamalite | (Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44 |
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| Taniajacoite | SrCaMn23+Si4O11(OH)4 · 2H2O |
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| Taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)(OH)2 |
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| 'Taramite Root Name Group' | A(CaNa)(Z32+Z23+)(Al2Si6O22)(OH,F,Cl)2 |
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| Tarbagataite | (K◻)Ca(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)5 |
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| Taseqite | Na12Sr3Ca6Fe3Zr3Nb[(Si3O9)2(Si9O27)2SiO]Cl2(O,OH,H2O)3 |
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| 'Tawmawite' | {Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH) |
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| Ternesite | Ca5(SiO4)2(SO4) |
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| Terranovaite | (Na,Ca)8(Si68Al12)O160 · 29H2O |
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| 'Tetraferrinontronite' | Mg0.20Fe3+3.80[(Si6.98Al0.15Fe3+0.87)O20](OH)4Ca0.45Mg0.15Na0.02 |
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| Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O |
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| Thomsonite-Ca | NaCa2[Al5Si5O20] · 6H2O |
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| Thomsonite-Sr | Na(Sr,Ca)2[Al5Si5O20] · 7H2O |
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| 'Thorian Britholite-(Ce)' | (Na,Ca,Ce,Th)5(P,Si)3O12(OH,F) |
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| Thorosteenstrupine | (Ca,Th,Mn)3Si4O11F · 6H2O |
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| 'Thorsite' | Th2CaSi9O22(OH)2 · nH2O |
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| 'Thulite' | {Ca2}{Al,Mn33+}(Si2O7)(SiO4)O(OH) |
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| 'Tibiscumite' | (Ca,Na,K)0.7(Al,Fe,Mg)2(Si,Al)4O10(OH)2 · 0.8H2O |
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