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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
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
Sklodowskite: (H3O)2Mg(UO2)2(SiO4)2·4(H2O)
Comments: Yellow cotton-ball spray of acicular sklodowskite. Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Skutterudite: (Co,Ni)As3-x
Comments: Cubic crystals of Skutterudite on matrix. Location: Bou Azzer, Anti-Atlas Mountains, Morrocco. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Smithsonite: ZnCO3
Comments: Twinned crystals of smithsonite on matrix. Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sodalite: Na8Al6Si6O24Cl2 Perovskite: CaTiO3
Comments: Clear crystals of sodalite with hoppered perovskite on matrix. Location: Udersdorf, Rhineland-Palatinate, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Soddyite: (UO2)2SiO4·2(H2O)
Comments: Yellow crystals of soddyite. Location: Swambo mine, Mindingi, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sonoraite: Fe+++Te++++O3(OH)·(H2O)
Comments: Lime green crystalline aggregate of sonoraite. Location: Joe Shaft, Tombstone, Cochise County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Spangolite: Cu6Al(SO4)(OH)12Cl·3(H2O)
Comments: Blue, hexagonal (trigonal) crystals of spangolite on matrix. Location: Blanchard mine, Bingham, Socorro County, New Mexico, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sperrylite: PtAs2
Comments: Tin-white grain of sperrylite in chalcopyrite matrix. Location: Vermillion mine, Sudbury, Ontario, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals