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Chalcanthite

Chalcanthite – Cu(SO₄)·5H₂O

Elements: Copper, Sulfur, Oxygen, Hydrogen

Class: Sulfates

Crystal System: Triclinic

Hardness: 2.5

Calcite

Talc (1)Diamond (10)

Soft. A fingernail can scratch it.

Origin: Posey Mine, Red Canyon, San Juan Co., Utah – Usa