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Galena, Chalcopyrite, Sphalerite & Calcite

Galena – PbS

Elements: Lead, Sulfur

Class: Sulfides

Crystal System: Cubic

Hardness: 2.5-2.75

Calcite

Talc (1)Diamond (10)

Soft. A fingernail can scratch it.

Chalcopyrite – CuFeS₂

Elements: Copper, Iron, Sulfur

Class: Sulfides

Crystal System: Cubic

Hardness: 3.5-4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Sphalerite – ZnS

Elements: Zinc, Sulfur

Class: Sulfides

Crystal System: Cubic

Hardness: 3.5-4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Calcite – Ca(CO₃)

Elements: Calcium, Carbon, Oxygen

Class: Carbonates

Crystal System: Hexagonal

Hardness: 3

Calcite

Talc (1)Diamond (10)

A copper coin can scratch it.

Origin: Madan Ore Field, Rhodope Mts. – Bulgaria