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Spadaite: MgSiO2(OH)2·(H2O) (?)
Comments: Tan mottled silky fibrous spadaite, slightly flexible coatings. Location: Palos Verdes Hills, Los Angeles County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Spencerite: Zn4(PO4)2(OH)2·3(H2O)
Comments: Pale green pearly translucent spencerite, with divergent structure. Location: Salmo, Nelson Mining District, British Columbia, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Spertiniite: Cu(OH)2
Comments: Sparse blue spertiniite on serpentinite rock. Location: Jeffrey Quarry, Asbestos, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sphaerocobaltite: CoCO3 Vladimirite: Ca5(AsO3OH)2(AsO4)2·5(H2O)
Comments: Translucent white prismatic vladimirite microcrystals with pink sphaerocobaltite. Location: Irhtem Mine, near Bou Azzer, Ouarzazate, Morocco. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Spionkopite: Cu1.4S Yarrowite: Cu9S8
Comments: Blue-black metallic granular spionkopite, intermixed with yarrowite altering, with quartz. Location: Yarrow Creek, Alberta, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Blue-gray metallic yarrowite grains in granular quartz rock with spionkopite. Location: Yarrow Creek, Alberta, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Spurrite: Ca5(SiO4)2(CO3) Bredigite: Ca7Mg(SiO4)4
Comments: White veins of bredigite in massive gray spurrite (slabbed specimen). Location: Camphouse, Ardnamurchan, Argyll, Highland, Scotland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Spurrite: Ca5(SiO4)2(CO3)
Comments: Dark to light purple massive spurrite (cut face). Location: South Sister Peak, Tres Hermanas Mountains, Luna County, New Mexico, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stanleyite: (V++++O)SO4·6(H2O) Patronite: VS4
Comments: Blue crystalline stanleyite on dark patronite. Location: Minas Ragra, Junin, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Starkeyite: MgSO4·4(H2O)
Comments: Translucent starkeyite on rock. Location: Barvue Mine, Barville, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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