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Steigerite: AlVO4·3(H2O)
Comments: Earthy yellow steigerite masses on sandstone. Location: Yellow Cat District, Grand County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stenonite: (Sr,Ba,Na)2Al(CO3)F5
Comments: White nearly opaque stenonite with minor pyrite grains. Location: Ivigtut, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stepanovite: NaMgFe+++(C2O4)3·8-9(H2O)
Comments: Translucent yellow crystalline stepanovite fragment. Location: Chai-Tumus, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sterryite: Ag2Pb10(Sb,As)12S29
Comments: Back prismatic sterryite microcrystals and massive in white calcite. Location: Taylor Pit, Madoc, Ontario, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stevensite: (Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2·n(H2O)
Comments: Granular massive stevensite. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stibiopalladinite: Pd5Sb2
Comments: Gray metallic stibiopalladinite, with bronze tarnish, flattened crystal grains. Location: Choco, Columbia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stibiotantalite: SbTaO4
Comments: Translucent stibiotantalite crystal. Location: Himalaya Mine, Mesa Grande, San Diego County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stilpnomelane: K(Fe++,Mg,Fe+++)8(Si,Al)12(O,OH)27·n(H2O)
Comments: Golden metallic scaly stilpnomelane on pink orthoclase. Location: French Creek No. 2 Mine, near Saint Peters, Chester County, Pennsylvania, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stistaite: SnSb
Comments: Minute stistaite crystal. Location: Edjej River, Kyrgyzstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stokesite: CaSnSi3O9·2(H2O)
Comments: Colorless transparent stokesite microcrystal in albite. Location: Corrego do Urucum, Galileia, Minas Gerais, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species