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*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987). ''pp. 33-34''
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987). ''pp. 33-34''
[[category:Crystallography]]
[[Category:Crystallography]]