At the Arizona-Tucson copper mine near Tucson, Arizona, pyrite crystals remarkably rich in faces have recently been found. Many of the individual crystals show representatives of all seven “fundamental” forms, and some show a total of ten forms. The crystals are rather small, averaging between an eighth and a quarter inch. However, since they are disseminated rather thickly in the calcite seams, and since the faces are very brilliant as well as numerous, good groups have the scintillating effect of a cluster of faceted gems.

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