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May-June 2014

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Collector's Guide to the Eudialyte Group

Minerals of the eudialyte group are generally rare, although eudialyte itself is relatively plentiful, occasionally produces fine crystals, and is a minor but very attractive lapidary material. The two dozen or so minerals in the group are complex, sodium-rich zirconosilicates whose crystal structure contains a unique combination of three- and nine-membered rings of SiO4 tetrahedra.

Dr. Robert J. Lauf is a materials scientist who is now a registered patent agent and technology consultant. He has published a number of books and articles on minerals and is the series editor for Schiffer Earth Science Monographs.

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