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Riebeckite: [ ]Na2(Fe++3Fe+++2)Si8O22(OH)2
Comments: Grayish black, coniform, massive crystals of riebeckite. Location: Cape Province, South Africa. Scale: 8x6 cm. © Dave Barthelmy
Robinsonite: Pb4Sb6S13
Comments: Dark gray, prismatic-acicular crystals of robinsonite on white marble. Location: Pitone Quarry, Seravezza, Lucca, Italy. Scale: Picture size 2 cm. © Dave Barthelmy
Sampleite: NaCaCu5(PO4)4Cl·5(H2O)
Comments: Blue, spherical, radial crystalling aggregates of sampleite on a fracture surface. Location: North Parkes Mine, Parkes, New South Wales, Australia. Scale: Picture size 6x5 cm. © Dave Barthelmy
Sanidine: (K,Na)(Si,Al)4O8
Comments: Blocky, opalescent crystal of sanidine. Location: Mina La Pili, Carmago, Chihuahua, Mexico. Scale: Crystal size 3x2 cm. © Dave Barthelmy
Satterlyite: (Fe++,Mg)2(PO4)(OH)
Comments: Cleaved nodule of brown crystalline satterlyite aggregate. Location: Big Fish River, Yukon, Canada. Scale: 3 x 1.5 cm. © Dave Barthelmy
Senaite: Pb(Ti,Fe,Mn)21O38
Comments: Black crystal of senaite. Location: Presidente Kibitschek, Minas Gerias, Brazil. Scale: Crystal size 2 mm. © Dave Barthelmy
Spodumene: LiAlSi2O6
Comments: Stacked crystals of Spodumene (Var. Kunzite). Location: Galileia, Minas Gerais, Brazil. Scale: Crystal size 7 cm. © Dave Barthelmy
Stellerite: CaAl2Si7O18·7(H2O)
Comments: Orange, blocky crystalline stellerite aggregate. Location: Tambar Springs, New South Wales, Australia. Scale: Picture size 6x4 cm. © Dave Barthelmy
Stibnite: Sb2S3
Comments: Prismatic crystals of metallic-lustered stibnite. Location: Xikuangshan Mine, Lengshuijang, Hunan Province, China. Scale: Crystal size 5-10 cm. © Dave Barthelmy
Sulvanite: Cu3VS4
Comments: Cubic grains of bronze-gray sulvanite crystals in marble. Location: Val Bona quarry, Carrara, Italy. Scale: Picture size 1 cm. © Dave Barthelmy