Halides
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The halides are compounds in which a halogen element (chlorine, fluorine, iodine, or bromine) is the sole anion, as in halite, NaCl. These minerals are relatively soft, weak, and brittle, and many of them will dissolve readily in water. Those that are not soluble in water generally crystallize in the isometric crystal system and develop as cubes. Chesterman, p. 425
Sources
- Chesterman, Charles W. The Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf: New York (1987)