Cyanotrichite

sulphate

brochantite

Formula: Cu4Al2(SO4)(OH)12(H2O)2 sulphate
Specific gravity: 3.7 to 3.9
Hardness: 3½ to 4
Streak: Blue
Colour: Sky blue
Solubility: Moderately soluble in hydrochloric, sulphuric and nitric acid
Environments:

Hydrothermal environments

Cyanotrichite is a secondary copper mineral found sparsely in the oxidation zones of hypothermal (high temperature) copper-bearing ore bodies rich in aluminium and sulphate. Associated minerals include brochantite, spangolite, chalcophyllite, olivenite, tyrolite, parnauite, azurite and malachite.

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