Cyanotrichite

cyanotrichite

chalcophyllite

parnauite

brochantite

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Formula: Cu4Al2(SO4)(OH)12(H2O)2
Hydrated sulphate containing hydroxyl
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 (HOM).

Localities

At the Cap Garonne mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, France, cyanotrichite occurs with chalcophyllite and parnauite (Dana).

At the Khder Mine, Ouisselsate Caïdat, Amerzgane Cercle, Ouarzazate Province, Drâa-Tafilalet Region, Morocco, cyanotrichite forms pale blue crusts on vein quartz, with many other secondary copper minerals (Minrec 38.5.371).

The type locality is the Moldova Nouă Mine, Moldova Nouă-Sasca Cu-Mo ore field, Caraş-Severin, Romania.

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