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==Sources==
 
==Sources==
 
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987), ''p. 471''
 
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987), ''p. 471''
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[[Category:Mineralogy]]
 
[[Category:Mineralogy]]
 
[[Category:Soil]]
 
[[Category:Soil]]
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[[Category:Ions]]
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