Brilliant Green Fluorescent Willemite from the Sterling Mine

A red/brown, somewhat rhombohedral, piece of nearly pure willemite, with minor calcite. This red variety of willemite contains manganese and is known as Troostite. Under short wave UV the willemite fluoresces very bright green with lasting phosphorescence, and two small areas of calcite show a typical red response. The specimen shows a similar, but less bright, response under long wave UV. The dimensions of this piece are 45.4 x 41.4 x 19.5 mm, and it weighs 80 grams.

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