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323 bytes added ,  06:51, April 22, 2007
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A '''mammillary''' [[Mineral Aggregates|mineral aggregate]] forms smooth, rounded masses. [[Hematite]] is an example of a [[mineral]] exhibiting a mammillary form. Chesterman, p. 40

=Sources=
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)
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