Geode

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A geode mineral aggregate is a rounded, hollow nodule, lined with crystals, usually quartz or calcite. Amethyst is an example of a mineral exhibiting a geode 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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Geology