Enargite and Pyrite

Enargite – Cu₃AsS₄

Elements: Copper, Arsenic, Sulfur

Class: Sulfides – Sulfosalts

Crystal System: Orthorhombic

Hardness: 3

Calcite

Talc (1)Diamond (10)

A copper coin can scratch it.

Pyrite – FeS₂

Elements: Iron, Sulfur

Class: Sulfides

Crystal System: Triclinic

Hardness: 6-6.5

Orthoclase

Talc (1)Diamond (10)

Scratches glass. Harder than a steel knife.

Origin: Steward Mine, Butte Mining District, Butter-Silver Bow, Montana – Usa

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