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Phenakite

Type Locality
Izumrudnye Kopi area, Malyshevo, Ekaterinburg (Sverdlovsk), Sverdlovskaya Oblast', Middle Urals, Urals Region, Russia
Mineral Data
Be2SiO4
Strunz: 
9.AA.05
Physical Properties
Hardness: 
7.5 - 8.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Phenacite