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Algodonite: Cu6As
Comments: Massive specimen of dark algodonite with vuggy areas filled with minute crystals. Location: Algodones Mines, Coquímbo Province, Chile. Scale: 4x3x3 cm. © John Betts - Fine Minerals
Algodonite: Cu6As Koutekite: Cu5As2
Comments: Silvery metallic koutekite with darker gray algodonite. Location: Mohawk Mine, Keweenaw County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species