| Riversideite | Ca5(HSi3O9)2 · 2H2O |
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| Roeblingite | Pb2Ca6Mn2+(Si3O9)2(SO4)2(OH)2 · 4H2O |
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| Roggianite | Ca2Be(OH)2Al2Si4O13 · 2.5H2O |
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| Rosenhahnite | HCa3[Si3O9(OH)] |
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| 'Rosstrevorite' | {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) |
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| Ruizite | Ca2Mn23+[Si4O11(OH)2](OH)2 · 2H2O |
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| Rustumite | Ca10(Si2O7)2(SiO4)(OH)2Cl2 |
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| Sacrofanite | (Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2O |
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| Sadanagaite | {Na}{Ca2}{Mg3Al2}(Si5Al3O22)(OH)2 |
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| 'Sadanagaite Root Name Group' | A (Ca2)(Z32+Z23+)(Si5Al3O22)(OH,F,Cl)2 |
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| Samfowlerite | Ca28Mn6Zn4(Be,Zn)4Be12[(OH)3(SiO4)3(Si2O7)2]4 |
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| Santaclaraite | CaMn4[Si5O14OH](OH) · H2O |
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| Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
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| Sarcolite | Na4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl) |
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| Saryarkite-(Y) | Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2O |
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| Scandio-winchite | ◻(NaCa)(Mg4Sc)(Si8O22)(OH)2 |
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| Scandiobabingtonite | Ca2(Fe2+,Mn)ScSi5O14(OH) |
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| Scawtite | Ca7(Si3O9)2CO3 · 2H2O |
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| Schizolite | NaCaMnSi3O8(OH) |
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| Scolecite | CaAl2Si3O10 · 3H2O |
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| Selsurtite | (H3O)12Na3(Ca3Mn3)(Na2Fe)Zr3◻{Si(Si3O9)2(Si9O27)Si9O24(OH)3}(OH)Cl(H2O) |
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| Semenovite-(Ce) | Na8Ca2FeBe6Ce2Si14O40(OH)4F4 |
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| Senkevichite | CsKNaCa2TiO[Si7O18](OH) |
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| Sergevanite | Na15(Ca3Mn3)(Na2Fe)Zr3Si26O72(OH)3 · H2O |
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| Shijiangshanite | Pb3CaAl(Si5O14)(OH)3 · 3H2O |
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| Shinichengite | Ca5[BSi2O7(OH)2]2 · 6H2O |
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| Shlykovite | KCa[Si4O9(OH)] · 3H2O |
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| 'Shuiskite Subgroup' | Ca2XCr23+[Si2O6(OH)][SiO4](OH)2A |
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| Shuiskite-(Cr) | Ca2Cr3+Cr23+[Si2O6OH][SiO4](OH)2O |
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| Shuiskite-(Mg) | Ca2MgCr23+[Si2O6OH][SiO4](OH)2(OH) |
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| Silesiaite | Ca4Fe23+Sn2(Si2O7)2(Si2O6OH)2 |
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| 'Silico-apatite' | Ca5Si3O9(OH)4 |
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| 'Silicosmirnovskite' | (Th,Ln,Ca)3(Si,P)4(O,OH)16 · 4H2O |
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| Siudaite | Na8(Mn22+Na)Ca6(Fe3+,Mn2+)3Zr3NbSi24(Si,◻,Ti)O74(OH)2Cl · 5H2O |
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| 'Skolite' | H4K(Mg,Fe2+,Ca)(Al,Fe3+)3Si6O20 · 4H2O |
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| Slyudyankaite | Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2O |
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| 'Smaragdite' | Ca2(Mg,Fe2+,Cr)5Si8O22(OH)2 |
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| '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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| 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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| Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
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| Stokesite | CaSn[Si3O9] · 2H2O |
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| Strätlingite | Ca2Al2SiO7 · 8H2O |
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| Stringhamite | CaCu(SiO4) · H2O |
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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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