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Schaurteite: Ca3Ge++++(SO4)2(OH)6·3(H2O)
Comments: Snow white acicular crystals of schauteite to about 1mm in a matted mass. Location: Tsumeb mine, Tsumeb, Namibia. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Schiavinatoite: (Nb,Ta)BO4
Comments: Black, 3mm euhedral crystal of schiavinatoite in matrix. Location: Ampanodiana Sud, Tetezantsio, Mahaiza, Madagascar. Scale: 3x2x2cm. © Tom Loomis / Dakota Matrix
Senarmontite: Sb2O3
Comments: Perfect octahedral, transparent, light to dark gray senarmontite crystals to 3mm. Location: Djebel Haminate mine, Ain Beida, Constantine, Algeria. Scale: Pictrure size 1.5 cm. © Tom Loomis / Dakota Matrix
Sewardite: CaFe+++2(AsO4)2(OH)2
Comments: Deep red, micaceous sewardite crystals mistakenly identified as carminite. Location: Benjamin Hill, Sonora, Mexico. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Shattuckite: Cu5(SiO3)4(OH)2
Comments: Blue micro acicular or fibrous crystals of shattuckite to 0.1mm free standing in vug. Location: New Cornelia mine, Pima Co., Arizona, USA. Scale: Picture size 2.5 mm. © Tom Loomis / Dakota Matrix
Shortite: Na2Ca2(CO3)3
Comments: Triangular shortite crystal in kerogenaceous dolomitic marlstone from the saline zone in the Green River Formation. Location: Green River, Sweetwater Co., Wyoming, USA. Scale: Crystal Size 2 mm. © Tom Loomis / Dakota Matrix
Sincosite: Ca(V++++O)2(PO4)2·5(H2O)
Comments: Tabular single crystals of sincosite to 2 mm on drusy quartz. Location: Ross Hannibal Mine, Lawrence Co., South Dakota, USA. Scale: Picture size 1.5 cm. © Tom Loomis / Dakota Matrix
Sinkankasite: H2MnAl(PO4)2(OH)·6(H2O)
Comments: White crystalline spray of acicular sinkankasite to 1mm on matrix. Location: Barker mine, Keystone, Pennington County, South Dakota, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Sohngeite: Ga(OH)3
Comments: Minute, pale yellow sohngeite crystals to less than 0.2mm on matrix. Location: Tsumeb mine, Tsumeb , Namibia. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix
Sonolite: Mn9(SiO4)4(OH,F)2
Comments: Dark red anhedral grains of sonolite in matrix. Location: Crouse mine, Bald Knob, Alleghany Co., North Carolina, USA. Scale: Crystal size 0.75 mm. © Tom Loomis / Dakota Matrix