Bright blue fibrous chalcanthite crust on a tan matrix with mirror reflection.
Macro photograph of fibrous bright blue chalcanthite crystals with white mineral alterations.
Close-up view of bright blue fibrous chalcanthite on a tan host matrix.

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
Did you know?

Many of the vivid blue chalcanthite crystals on the market are grown in a lab, since natural ones can dissolve in a single drop of water.

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