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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
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
Sulphotsumoite: Bi3Te2S
Comments: Dark gray sulphotsumoite, tarnishing, foliated in milky quartz. Location: Mina de la Carcel, Zacatecas, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Suolunite: Ca2Si2O5(OH)2·(H2O)
Comments: Translucent massive suolunite. Location: Oman. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Suredaite: PbSnS3
Comments: Silvery metallic columnar suredaite in matrix. Location: Pirquitas Mine, Jujuy, Argentina. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sursassite: Mn++2Al3(SiO4)(Si2O7)(OH)3
Comments: Coppery-red colored silky fibrous sursassite vein with white quartz in rock. Location: Strategic Manganese Mine, near Woodstock, New Brunswick, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sussexite: MnBO2(OH)
Comments: Red resinous sussexite in ore matrix. Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Svyazhinite: MgAl(SO4)2F·14(H2O)
Comments: Granular svyazhinite aggregate. Location: Chelyabinsk Coal Basin, Kopeisk, Chelyabinsk District, Southern Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Swartzite: CaMg(UO2)(CO3)3·12(H2O)
Comments: Pale yellow powdery swartzite, intermixed with gypsum on schist rock. Location: Hillside Mine, Bagdad, Yavapai County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Swinefordite: (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2·2(H2O)
Comments: Dark green leathery swinefordite coating on pegmatite. Location: Foote Mine, King's Mountain, Cleveland County, North Carolina, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species