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