Sulfates
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The sulfates are compounds of one or more metallic elements with the sulfate radical. This is a large class of minerals, whose members have few properties in common. In general they are light in color and transparent to translucent. None are hard, and most are fragile. Chesterman, p. 453
Sources
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)