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Spessartine: Mn++3Al2(SiO4)3
Comments: Dodecahedral crystal of spessartine garnet on matrix. Location: Haramosh Mountains, Baltistan, Northern Areas, Pakastan. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
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
Stewartite: Mn++Fe+++2(PO4)2(OH)2·8(H2O) Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Comments: Pointed, brownish yellow stewartite crystals on massive, dark rockbridgeite. Location: Hagendorf, Bavaria, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)
Comments: Tabular, honey-colored stilbite (stilbite-Ca?) crystals on matrix. Location: Gunnedah, New South Wales, Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Stolzite: PbWO4
Comments: White stolzite crystals on matrix. Location: Tuena mine, New South Wales, Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Strashimirite: Cu8(AsO4)4(OH)4·5(H2O)
Comments: Green, radial sprays of acicular strashimirite crystals on matrix. Location: Majuba Hill mine, Pershing County, Nevada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Strengite: Fe+++PO4·2(H2O)
Comments: Pink, bladed, stellate spray of strengite crystals on matrix. Location: Indian Mountain, Cherokee County, Alabama, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Stringhamite: CaCuSiO4·2(H2O) Wollastonite-1A: CaSiO3
Comments: Rounded aggregate of dark blue stringhamite crystals on bladed, white wollastonite. Location: Christmas mine, Hayden, Gila County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Strontiojoaquinite: (Na,Fe++)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O)
Comments: Yellow, pointed crystals of Strontiojoaquinite on matrix. Location: Mina Numero Uno, San Benito County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals