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Volfsonite: Cu+10Cu++Fe++Fe+++2Sn++++3S16 Stannite: Cu2FeSnS4
Comments: Bluish-black octahedron of stannite (also known as volfsonite). Location: Yaogangxian Wolfram mine, Yizhang County, Hunan Province, China. Scale: See Image. © Rruff Database
Comments: Stannite crystal cluster at the base of a quartz crystal. Volfsonite is now consideres stannite. Location: Yaogangxian mine, Hunan, China. Scale: Crystal size 3 cm. © John Attard