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Sidwillite: MoO3·2(H2O)
Comments: Thin olive-green sidwillite coatings on quartz crystals. Location: Lake Como, Summit County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Siegenite: (Ni,Co)3S4 Cattierite: CoS2
Comments: Pinkish metallic cattierite, intergrown with gray siegenite. Location: Shinkolobwe, Katanga, Shaba, Zaire. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Silhydrite: 3SiO2·(H2O)
Comments: Fine grained massive silhydrite. Location: Near Rome, Oregon, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sillimanite: Al2SiO5 = Al[6]Al[4]OSiO4
Comments: Silky massive sillimanite. Location: Khasia Hills, Assum, India. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Silver: Ag Mckinstryite: (Ag,Cu)2S
Comments: Black metallic massive mckinstryite with wire silver. Location: Peregrina Mine, Guanajuato, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Simpsonite: Al4(Ta,Nb)3O13(OH)
Comments: Translucent pale pink simpsonite crystal fragment. Location: Alto do Giz, Equidor, Rio Grande do Sol, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sinhalite: MgAlBO4
Comments: Crystalline sinhalite in white marble. Location: Amity, near Warwick, Orange County, New York, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sitinakite: Na2K(Ti,Nb)4O4(SiO4)2(O,OH)·4(H2O)
Comments: Beige translucent crudely formed sitinakite (arrow) crystal with white natrolite and dark, acicular aegirine. Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sjogrenite: Mg6Fe+++2(CO3)(OH)16·4(H2O)
Comments: Red-brown sjogrenite crust on serpentinite rock. Location: Fort Point, San Francisco County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Skinnerite: Cu3SbS3
Comments: Dark gray skinnerite on matrix. Location: Bankove, Kosice, Vychodoslovensky, Slovakia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Slavikite: NaMg2Fe+++5(SO4)7(OH)6·33(H2O)
Comments: Bubbly slavikite crust. Location: Smolnicka Huta, Vychodoslovensky, Slovakia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Slawsonite: (Sr,Ca)Al2Si2O8
Comments: White crystalline slawsonite in rock. Location: Sarisaka, Kagami, Kochi, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Smolianinovite: (Co,Ni,Mg,Ca)3(Fe+++,Al)2(AsO4)4·11(H2O)
Comments: Tan to brown smolianinovite pseudomorphs after cobaltite crystals, with erythrite and tarnished cobaltite. Location: Mount Cobalt, Cloncurry, Queensland, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Smrkovecite: Bi2O(OH)(PO4)
Comments: Waxy smrkovecite botryoids in vuggy quartz. Location: Smrkovec, Zapadocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sobolevite: Na11(Na,Ca)4(Mg,Mn)Ti++++4(Si4O12)(PO4)4O5F3
Comments: Translucent crystalline sobolevite cleavage. Location: Mount Alluaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sodium meta-autunite: Na2(UO2)2(PO4)2·6-8(H2O)
Comments: Ganular metanatroautunite in red-brown muds. Location: Boomerang Lake, Menangina, Western Australia, Australia. Scale: Area Size 0.1 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Sogdianite: (K,Na)2(Li,Fe+++,Al)3ZrSi12O30
Comments: Somewhat greasy to vitreous massive sogdianite. Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sorbyite: Pb19(Sb,As)20S49
Comments: Gray metallic sorbyite stringers in white quartz. Location: Candelaria, Mineral County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sorensenite: Na4SnBe2Si6O18·2(H2O)
Comments: Translucent white prismatic sorensenite crystals and crystalline in dark aegirine. Location: Kvanefjeld, Ilimaussaq, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Souzalite: (Mg,Fe++)3(Al,Fe+++)4(PO4)4(OH)6·2(H2O)
Comments: Blue-gray radial sprays of souzalite in brown siderite. Location: Rapid Creek, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species