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Sphaerocobaltite: CoCO3
Comments: Calcite with numerous crystals of red sphaerocobaltite to 3 mm across. Location: Kamoto Mine, Mashamba, Katanga, Dem. Rep. of the Congo. Scale: Picture size 1.5 cm. © John Veevaert
Sphalerite: (Zn,Fe)S
Comments: Highly lustrous, black, complex sphalerite crystals to 15 mm in size completely covering the top of a sulfide matrix. Location: Nanisivik mine, Baffin Island, Northwest Territories, Canada. Scale: 6.5 x 7.5 x 1.8 cm. © Dan Weinrich
Sphalerite: (Zn,Fe)S Ankerite: Ca(Fe++,Mg,Mn)(CO3)2 Dickite: Al2Si2O5(OH)4
Comments: White, rhombohedral crystals of ankerite and dark gray, metallic sphalerite on beige dickite. Location: Prego mine, Kladno, Czech Rebublic. Scale: Picture size 2 cm. © Dave Barthelmy
Sphalerite: (Zn,Fe)S Baumhauerite-2a: Pb3As4S9
Comments: Dark crystal of baumhauerite-2a (same shape as baumhauerite) with olive-green transparent sphalerite crystal on white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture 2 cm tall. © Walter Gabriel
Spinel: MgAl2O4
Comments: Spinel on white marble. Location: Mogok, Myanmar. Scale: 2.2 x 1.5 cm. © Fabre Minerals
Spionkopite: Cu1.4S Yarrowite: Cu9S8
Comments: Blue-gray metallic yarrowite grains in granular quartz rock with spionkopite. Location: Yarrow Creek, Alberta, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Blue-black metallic granular spionkopite, intermixed with yarrowite altering, with quartz. Location: Yarrow Creek, Alberta, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Spiroffite: (Mn,Zn)2Te3O8
Comments: Milky yellow crystalline aggregate of Spiroffite on matrix. Location: Moctezuma mine, Sonora, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Spodiophyllite: (Na,K)4(Mg,Fe++)3(Fe+++,Al)2(Si8O24)
Comments: Gray to black prismatic spodiophyllite crystals in matrix. Location: Mt. Kukisvumtchorr, Chibiny, Kola, Russia. Scale: Specimen Size 4x4 cm. © Diederik Visser
Spodumene: LiAlSi2O6
Comments: Stacked crystals of Spodumene (Var. Kunzite). Location: Galileia, Minas Gerais, Brazil. Scale: Crystal size 7 cm. © Dave Barthelmy