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The chromates are compounds of metallic elements with the chromate (CrO42-) radical. This is a small class of minerals, and its members are usually brightly colored. Only one variety, crocoite, is of interest to most collectors.


  • Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987), p. 469