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Rowleyite

[Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6·n[H2O,Na,NH4,K,Cl]

Rudenkoite

Sr3Al3.5Si3.5O10(OH,O)8Cl2·H2O

Rundqvistite-(Ce)

Na3(Sr3Ce)[Zn2Si8O24]

Rustenburgite

Pt3Sn

Ruthenarsenite

(Ru,Ni)As

Ryabchikovite

CuMgSi2O6

Salammoniac

(NH4)Cl

Samraite

Ni2P2O7

Sapphirine

Mg4(Mg3Al9)O4[Si3Al9O36]

Saranovskite

SrCaFe2+ 2(Cr4Ti2)Ti12O38

Sassite

Ti3+2Ti4+O5

Sassolite

B(OH)3

Satpaevite

Al12(V4+,V5+)8O37·30H2O (?)

Savelievaite

Mg2Cr3+O2(BO3)

Sazykinaite-(Y)

Na5YZrSi6O18·6H2O

Sbacchiite

Ca2AlF7

Sborgite

NaB5O6(OH)4·3H2O

Rotherkopfite

KNa2(Fe2+2.5Ti1.5)Fe2+(Si4O12)2

Ruthenium

Ru

Sapozhnikovite

Na8(Al6Si6O24)(HS)2

Sarrochite

[Ca4(H2O)38][Mo8P2Fe3+3O37(OH)]

Scandio-fluoro-eckermannite

NaNa2(Mg4Sc)(Si8O22)F2

Selenojunoite

Cu2Pb3Bi8Se16

Sidorenkite

Na3Mn(PO4)(CO3)

Schreibersite

(Fe,Ni)3P

Selenodantopaite

Ag5Bi13Se22

Seinäjokite

FeSb2

Siderite

FeCO3

Trigonal H: 3.5-4.5

Selsurtite

(H3O)12Na3(Ca3Mn3)(Na2Fe)Zr3◻Si[Si24O69(OH)3](OH)Cl·H2O

Silicocarnotite

Ca5[(PO4)(SiO4)](PO4)

Spinel

MgAl2O4

Cubic (Isometric) H: 7.5-8.0

Stetefeldtite

Ag2Sb2(O,OH)7

Silicon

Si

Smirnovskite

(Th,Ca)(PO4)·nH2O

Steinhardtite

Al

Simonellite

C19H24

Sodalite

Na4Al3Si3O12Cl

Cubic (Isometric) H: 5.5-6.0

Sperlingite

(H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)][(H2O)9(OH)]·4H2O

Stevensite

(Ca,Na)xMg3-ySi4O10(OH)2

Silver

Ag

Cubic (Isometric) H: 2.5-3.0

Skogbyite

Zr(Mg2Mn3+ 4)SiO12

Staurolite

Fe2Al9Si4O23(OH)

Monoclinic H: 7.0-7.5

Surinamite

Mg3Al3O(Si3BeAlO15)

Stishovite

SiO2

Sveite

KAl7(NO3)4(OH)16Cl2·8H2O

Svornostite-(NH4)

(NH4)2Mg(UO2)2(SO4)4(H2O)8

Tantalaeschynite-(Ce)

Ce(TiTa)O6

Talc

Mg3Si4O10(OH)2

Monoclinic H: 1.0