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Berthierite

Berthierite – FeSb₂S₄

Elements: Iron, Antimony, Sulfur

Class: Sulfides

Crystal System: Orthorhombic

Hardness: 2-3

Calcite

Talc (1)Diamond (10)

Soft. A fingernail can scratch it.

Origin: Herja Mine, Chiuzbaia, Baia Mare, Marmures – Romania