
Phenakite is an uncommon mineral, found as white or colourless tabular crystals or stubby prisms. Twinning is typical and distinguishes it from rock crystal, with which it is confused (hence its name, based on the Greek word for cheat). Transparent crystals are faceted for that collector, and therefore are hard and bright.
Phenakite happens in pegmatites, granites and mica schists. The very best crystals are simply within the Urals (Russia), Brazil, and Colorado (USA). Other localities include Italy, Sri Lanka, Zimbabwe, and Namibia.
A pebble weighing 1,470 carats was present in Sri Lanka, and faceted to some 569 carat oval and many smaller stones.
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