The x-ray powder data for wurtzite from Llallagua, Bolivia, reported by Smith and others are here supplemented by single crystal data. Both the cell dimensions obtained, a = 3.881 and c = 6.315 A, which are larger than for ordinary wurtzite, and the specific gravity, between 3.64 and 3.73, are in keeping with increasing substitution of Fe and Mn for Zn in sphalerite. The substitution of Mn has a greater effect on the cell dimensions and specific gravity.

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