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Most, if not all, of Iowa’s gems and minerals are products of crystallization in underground cavities that filled with water containing dissolved chemicals. The famed Iowa geodes (Iowa’s state rock) are products of a complex process of replacement and cavity-filling in the Warsaw Shale. Armored by a rind of tough chalcedonic quartz, these spheroidal masses, which range up to more than a meter across, weather out of the host rock and accumulate along streams in the southeastern part of the state. During the Pleistocene Epoch, large masses of glacial ice rafted the ultra-fine-grained variety of quartz called Lake Superior agates, which had previously weathered out of their host rocks, southward into Iowa. They can be found in the gravels that have accumulated along major streams in the eastern half of the state.

Iowa’s long record of mining lead, coal, gypsum, and limestone contains a rich history; the forty-seven mineral specimens inIowa Gems and Minerals in Your Pocketmake up a fascinating illustrated guide to that history. Carefully lit and photographed to reveal both maximum detail and maximum beauty, each specimen becomes a work of art.

Nevada has an extraordinary diversity of minerals, some of them unique to the state and some the focus of human exploitation for millennia. Minerals of Nevada is the first synoptic catalog of Nevada minerals, listing every mineral found in the state along with the places where they occur. The book includes the geologic history of the state, the history of mining in Nevada, descriptions of significant mineral deposits and mining districts, maps, and an album of striking color photographs of rare and important minerals.

The Missouri Handbooks are intended to bring the products of extensive research to the general public in nontechnical yet scholarly terms and in a convenient paperback format.