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Spodumene: LiAlSi2O6
Comments: Stacked crystals of Spodumene (Var. Kunzite). Location: Galileia, Minas Gerais, Brazil. Scale: Crystal size 7 cm. © Dave Barthelmy
Spriggite: Pb3[(UO2)6O8(OH)2](H2O)x; x ~ 3
Comments: Secondary electron microscope image of spriggite crystals and twins. (AmMin, 89:341). Location: Number 2 workings, Radium Ridge, Northern Flinders Ranges, South Australia. Scale: See Image. © American Mineralogist
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
Squawcreekite: (Fe+++,Sb+++++,W++++++)O4·(H2O) Tripuhyite: Fe++Sb+++++O4
Comments: Micro red-orange squawcreekite crystals in matrix. The mineral is now considered to be a Zn-bearing variety of Tripuhyite. Location: Squaw Creek Tin Mine, Catron County, New Mexico. Scale: Not Given. © Diederik Visser
Srebrodolskite: Ca2Fe+++2O5 Periclase: MgO
Comments: Black grains of srebrodolskite with white periclase. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Srebrodolskite: Ca2Fe+++2O5 Kumtyubeite: Ca5(SiO4)2F2 Wadalite: Ca6Al5Si2O16Cl3 Rondorfite: Ca8Mg(SiO4)4Cl2
Comments: BSE image of kumtyubeite (Kmt) associated with srebrodolskite (Srb), bultfonteinite (Blt), Ca- kydrosilicates, wadalite (Wad), rondorfite (Rndr), and ettringite (dark gray). (AmMin, v94:1361). Location: Rock-forming mineral found in skarn carbonate-xenoliths in ignimbrites of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia. Scale: See Image. © American Mineralogist
Srilankite: (Ti,Zr)O2
Comments: Backscatter electron image of srilankite (Sri) - rutile (Rt) - ilmenite (Ilm) composite grain (AmMin, v 89, p 761). Location: Atlantis II Fracture Zone, Southwest Indian Ridge, Southern Indian Ocean. Scale: See Image. © American Mineralogist
Stanfieldite: Ca4(Mg,Fe++,Mn)5(PO4)6
Comments: B&W BSE image of a fragment of stanfieldite in an epoxy grain mount. Location: Brahin Meteorite, Pallasite, Minsk, Belarus (1810). Scale: See Image. © Diederik Visser
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
Stannite: Cu2FeSnS4 Volfsonite: Cu+10Cu++Fe++Fe+++2Sn++++3S16
Comments: Stannite crystal cluster at the base of a quartz crystal. Volfsonite is now consideres stannite. Location: Yaogangxian mine, Hunan, China. Scale: Crystal size 3 cm. © John Attard
Stannite: Cu2FeSnS4 Zinkenite: Pb9Sb22S42
Comments: Acicular crystals of zinkenite perched on a twinned, crystal of stannite. Location: Mina San José, Oruro, Bolivia. Scale: 4 x 2.3 x 1.7 cm. © Fabre Minerals
Comments: Bluish-black octahedron of stannite (also known as volfsonite). Location: Yaogangxian Wolfram mine, Yizhang County, Hunan Province, China. Scale: See Image. © Rruff Database
Stannoidite: Cu8Fe3Sn2S12
Comments: Polished section (PPL) image showing a rim of V-stannoidite on colusite (co) grain in massive bornite (bn). Location: Kidd Creek Volcanogenic Massive Sulfide deposit, Western Abitibi Subprovince, Timmins, Ontario, Canada. Scale: Picture Size 0.25 mm. © National Resouces of Canada
Stannomicrolite: (Sn++,Fe++,Mn++)(Ta,Nb,Sn++++)2(O,OH)7 Stokesite: CaSnSi3O9·2(H2O)
Comments: Stokesite "ball" composed of lath-like tan or clear crystals with several micro crystals of yellow stannomicrolite. Location: Urucum mine, Galileia, Minas Gerais, Brazil. Scale: 1.2 cm. © Tom Loomis / Dakota Matrix
Stannopalladinite: (Pd,Cu)3Sn2 (?)
Comments: PPL polished section image of hexagonal crystal of stannopalladinite (white with a very slight pinkish tint) in white atokite. Inset image x-polarizers. Location: Oktyabrski Mine, Talnakh, Ural, Russia. Scale: Picture Size 0.57 mm. © Thomas Witzke
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
Staurolite: (Fe++,Mg)2Al9(Si,Al)4O20(O,OH)4
Comments: Cruciform twinned staurolite crystals without matrix. Location: Marble, Cherokee Co., North Carolina, USA. Scale: 3x2.5x1.5 cm. © John Betts - Fine Minerals
Steacyite: K1-x(Ca,Na)2ThSi8O20 (x=0.2 to 0.4)
Comments: Square prismatic crystal of steacyite on acicular aegirine. Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Steenstrupine-(Ce): Na14Ce6Mn++Mn+++Fe++2(Zr,Th)(Si6O18)2(PO4)7·3(H2O)
Comments: Dark gray, coarse grained, elongated crystals of steenstrupine-(Ce) in matrix. Location: Kvanefield, Ilimanssaq, Greenland. Scale: Specimen Size 5.6 cm. © Paul M. Schumacher