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Hercynite

Type Locality
Poběžovice (Ronsperg; Ronsberg; Ronsperk), Plzeň Region, Bohemia (Böhmen; Boehmen), Czech Republic
Mineral Data
Fe2+Al2O4
Strunz: 
4.BB.05
Physical Properties
Hardness: 
7.5
Tenacity: 
brittle
Photos