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Siderotil: Fe++SO4·5(H2O)
Comments: Siderotil pseudomorphs after melanterite. Location: 2700' level, Campbell Shaft, Bisbee, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sidorenkite: Na3Mn(PO4)(CO3)
Comments: Dark brown sidorenkite masses in syenite rock. Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Comments: Equant, dark gray, metallic crystals of siegenite on matrix. Location: LaMotte mine, Fredericktown, Madison County, Missouri, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Sieleckiite: Cu3Al4(PO4)2(OH)12·2(H2O)
Comments: SEM image showing a hemisphere of sieleckiite on variscite crystals. (MinMag, 52:515). Location: Mt Oxide Copper Mine, 150 km north of Mt Isa, Queensland, Australia. Scale: Sphere Diameter 0.4 mm. © Mineralogical Magazine
Sigloite: Fe+++Al2(PO4)2(OH)3·5(H2O) Vauxite: Fe++Al2(PO4)2(OH)2·6(H2O)
Comments: Lime green, crystalline aggregate of sigloite on massive, blue vauxite. Location: Llallagua, Potosi Department, Bolivia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Silhydrite: 3SiO2·(H2O)
Comments: Fine grained massive silhydrite. Location: Near Rome, Oregon, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Silicon: Si Moissanite: SiC
Comments: Backscattered electron image of metallic inclusion in moissanite (SiC). The gray shading in the BSE mage consists mainly of pure silicon (Si metal). The brighter areas are composed of Fe-silicide. (AmMin, 88:1818). Location: Found in a cobble at a beach along the Turkish coast of the Mediterranean Sea, around 150 km NW from Izmir, and is most likely derived from Tertiary volcanic rocks outcropping in the area. Scale: Scalebar 200 µ-m. © American Mineralogist
Sillenite: Bi12SiO20
Comments: Greenish to yellowish grains of sillénite in matrix. Location: Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag