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Hardness (view source)

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*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)
 
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)
 
*Dana, Edward S. and Ford, William E. ''Dana's Textbook of Mineralogy - Fourth Edition'', John Wiley and Sons: New York (1932)
 
*Dana, Edward S. and Ford, William E. ''Dana's Textbook of Mineralogy - Fourth Edition'', John Wiley and Sons: New York (1932)
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[[category:geology]]
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