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a zinc sulfide mineral that occurs typically in Potosi, Bolivia; Butte, Mont.; and Goldfield, Nev. It is a rare and unstable (at temperatures below 1,020 C, [1,870 F]) hexagonally symmetrical modification of sphalerite, to which it inverts crystallographically; it may be made artificially from sphalerite by rapid cooling from 1,020 C. For detailed physical properties, see sulfide mineral (table)