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rare mineral, beryllium silicate, Be2SiO4, used as a gemstone. Phenakite has long been known from the emerald and chrysoberyl mine on the Takovaya River, near Yekaterinburg (formerly Sverdlovsk), in the Urals region of Russia, where large crystals occur in mica schist. It also occurs in the granite of the Ilmen Mountains in the Urals and of the Pikes Peak region in Colorado. Other notable localities include Kragero, Norway, and San Miguel de Piricicaba, Brazil. For detailed physical properties, see silicate mineral (table)