Cafarsite (Cubic)

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These matrix Cafarsites are fine examples of this rare alpine mineral. Cafarsite is a complex arsenate, rarely seen in the world; and these reddish-brown are actually cubic (the more rare habit for the species). The largest crystal measures 6 mm on edge, and the two crystals grew within a gap in this fine-grained gneiss. From the Piedmont region of Italy: the Type Locality for Cafarsite is also on Mt. Cervandone, although just across the Swiss border (still, it is the same deposit!). Overall, a very good specimen, with a sharp, unusual habit! Acquired in 1977.