[[Image:geode.gif|right]]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.<ref>Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987) p. 40</ref> | [[Image:geode.gif|right]]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.<ref>Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987) p. 40</ref> |