Barite n. : Native sulphate of barium, a mineral occurring in transparent, colorless, white to yellow crystals (generally tabular), also in granular form, and in compact massive forms resembling marble. It has a high specific gravity, and hence is often called heavy spar. It is a common mineral in metallic veins.

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Taxonomy
Baryte, mineral, barite crystals, free encyclopedia, barium, celestine, USA, history, The American, specification, crude, uniform size, agent, large number, Nevada, paints, paper, Hanor.

Defination from the web:
Barite-celestine geochemistry and enviroments of formation". Reviews in Mineralogy 40: 193-275. ISBN 0-939950-52-9. ... a b USGS page for Barite ^ a b c d "International Mineralogical Association: Commission on New Minerals and Mineral Names". Mineralogical Magazine 38: 102-105. March 1971. ...