Collector’s Edge Minerals, Inc. recognizes and thanks Rocks & Minerals for permission to use portions or all of their original article from “Rocks & Minerals”, Volume 85, Number 5, pp. 392-400.   Contributing authors were Robert B. Cook, Department of Geology, Auburn University, Auburn, Alabama 36849 and Thomas M. Gressman, Collector’s Edge Minerals, Inc., Golden, Colorado.

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