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Berthierite

Type Locality
Chazelles-Haut (Chazelle), Mercoeur, Haute-Loire, Auvergne, France
Mineral Data
FeSb2S4
Strunz: 
2.HA.20
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
2.0 - 3.0
Tenacity: 
brittle