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Ferroselite

Type Locality
Ust' Uyok deposit (Ust'-Uyuk), Turan District, Tuva Republic, Eastern-Siberian Region, Russia
Mineral Data
FeSe2
Strunz: 
2.EB.10a
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
Black
Hardness: 
6.0 - 6.5
Tenacity: 
very brittle