Chalcotrichite is a variety of cuprite. It usually occurs as thin fibrous sprays or mats of acicular (needle-like) and hair-like crystals in the voids of copper-rich rocks, in colours red to brownish red.

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Keywords: -, acicular, aggregates, brown, brownish, chalcotrichite, clusters, copper, crystalline, crystallography, crystals, cuprite, earth, fibrous, geological, geology, hair-, mat, mats, needle-, ore, ore-bearing, red, rock, rocks, sciences, silky, sprays, voids