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Struvite: (NH4)MgPO4·6(H2O)
Comments: Opaque, white crystal struvite aggregates in earthy matrix. Location: Skipton Caves, Victoria, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Yellow-brown tabular struvite crystal. Struvite is of organogenic origin and this type locality example is formed in manure pits. Location: Nicolaikirche, Hamburg, Germany. Scale: Specimen Size 1 x 1 x 1 cm. © Tom Loomis / Dakota Matrix
Studenitsite: NaCa2[B9O14(OH)4]·2(H2O)
Comments: Pale pink crystalline studenitsite micro fragment. Location: Piskanja, Srbija, Yugoslavia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Studtite: [(UO2)O2(H2O)2](H2O)2 Billietite: Ba(UO2)6O4(OH)6·8(H2O)
Comments: Acicular, white sprays of studtite crystals on yellow, tabular billietite. Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sturmanite: Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12·25(H2O)
Comments: Sharply terminated dark yellowish crystal of sturmanite with a few lesser crystals attached to one side. Location: N'Chwaning mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 17 x 10 x 16 mm. © Dan Weinrich
Sturtite: (Fe3+)(Mn2+,Ca,Mg)Si4O10(OH)3·10(H2O)
Comments: Dark red-brown resinous massive sturtite. Location: North Mine, Broken Hill, New South Wales, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Stutzite: Ag5-xTe3,(x=0.24-0.36)
Comments: Dull black stutzite grains in white-green calcite. Location: Mina Bambollita, Moctezuma, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Suanite: Mg2B2O5
Comments: Dark olive green nearly opaque suanite cleavage. Location: Houxianya, Yingkou, Liaoning, China. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sudburyite: (Pd,Ni)Sb
Comments: SEM image showing ilmenite-hematite (il-hm), chalcopyrite (ccpy), and magnetite-ulvospinel (mte-usp). Detailed SEM image shows composite grain of sudburyite and safflorite (7 x 4 µm). Location: Fesh road cut for Interstate 83 at Reesers Summit, one mile south of the exit for the Pennsylvania Turnpike between Harrisburg and York in York County, Pennsylvania, USA. Scale: See Image. © Pennsylvania DCNR
Sudoite: Mg2(Al,Fe+++)3Si3AlO10(OH)8 Manganite: MnO(OH)
Comments: Pinkish to nearly white earthy sudoite with dark manganite. Location: Ilfeld, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Suessite: (Fe,Ni)3Si
Comments: B&W image of suessite (white) as vein fillings and blebs. Silicates (olivine, pigeonite) are gray; carbonaceous matrix is black. Hydrous ferric oxide veins are (light gray). Location: North Haig olivine pigeonite achondrite (ureilite). (AmMin, v67:126). Scale: Scale Bar 100 µm. © American Mineralogist
Sugakiite: Cu(Fe,Ni)8S8
Comments: Reflected light polished section of sugakiite (sg) associated with bornite (bn), talnakhite (td) and native copper (Cu). (CanMin, v43:266). Location: Horoman, Samani-cho, Urakawa-gun, Japan. Scale: See Image. © Canadian Mineralogist
Sugilite: KNa2(Fe+++,Mn+++,Al)2Li3Si12O30 Effenbergerite: BaCuSi4O10
Comments: Blue effenbergerite pods to across in massive purple sugilite. Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Crystal size 4 mm. © John Veevaert
Sugilite: KNa2(Fe+++,Mn+++,Al)2Li3Si12O30 Pectolite: NaCa2Si3O8(OH)
Comments: Sharp terminated purple crystals of sugilite to 5mm on white, acicular pectolite. Location: Wessels Mine, Kalahari, South Africa. Scale: Picture size 1.5 cm. © John Veevaert
Suhailite: (NH4)Fe3(Si3Al)O10(OH)2
Comments: PPL thin-section showing unoriented grains of graphite-rich golden suhailite. Suh - suhalite, Ann - annite, Sil - sillimanite. (AmMin v94:211). Location: Betic Cordillera gneisses (Spain). Scale: See Image. © American Mineralogist
Sulfoborite: Mg3B2(SO4)(OH)8(OH,F)2
Comments: Colorless transparent sulfoborite crystal. Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sulfur: S8 Coccinite: Hg++I2 (?)
Comments: Orange-red coccinite on sulfur. Due to the volatility of the mineral at room temperature, the sample is preserved in a closed vial. The photo was made through the vial, therefore the sharpness is reduced. Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Sulfur: S8
Comments: Single complex crystal of sulfur on white, sucrosic aragonite. Location: Girgenti, Sicily, Italy. Scale: Crystal size 4.5. © John Veevaert
Sulfur: S8 Metastibnite: Sb2S3
Comments: Red coatings of metastibnite with yellow sulfur. Location: Steamboat Springs, Washoe County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sulphohalite: Na6(SO4)2FCl
Comments: Octahedral sulphohalite crystal. Location: Searles Lake, San Bernardino Co., California, USA. Scale: Crystal size 5 mm. © John Veevaert