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January-February 2017

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Geode Minerals from the American Midwest

A variety of spheroidal sedimentary structures occur in the American Midwest where they have been regarded as great curiosities. These rounded objects differ so much from the flat and layered rocks that host them that some have been given special names such as nodules, concretions, septaria, agates, and geodes. The focus of this article is on geodes, perhaps the most interesting to the collector, because their often hollow centers sometimes contain the surprise of beautiful and well-crystallized minerals.

Terry E. Huizing, a consulting editor of Rocks & Minerals, is adjunct curator of mineralogy at the Cincinnati Museum Center and focuses his personal mineral collecting activities on calcite, pseudomorphs, and minerals from the American Midwest.

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