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Line 1: − + − + − *Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)+
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A '''brittle''' [[mineral]] is easily broken into a [[powder]] by cutting or hammering. Chesterman, p. 32
A '''brittle''' [[mineral]] is easily broken into a [[powder]] by cutting or hammering.<ref>Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)</ref>
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