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Polybasite: [Ag9CuS4] [(Ag,Cu)6(Sb,As)2S7]
Comments: Cyclic-twinned polybasite grain embedded in matrix..
Location: The Zaca mine, Alpine Co., California, USA.
Scale: Grainsize .75 mm.
© Tom Loomis / Dakota Matrix
Comments: Lustrous, metallic steel-gray rosette of polybasite crystals.
Location: Guanajuato, Mexico.
Scale: 18 x 16 x 8 mm.
© Dan Weinrich