Robinsonite was known to occur only at the type locality in Pershing County, Nev., and at Madoc, Ontario, until a new locality was found during a study of kobellite (Harris et al, 1968) from Salmo, British Columbia. Microprobe analysis gave Pb 41.5, Bi 22, Sb 20, S 18 percent. X-ray powder diffraction data are tabulated and show a slightly enlarged cell, in keeping with the atomic radius of the substituting bismuth.

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