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Mineralpedia Details for Cyanotrichite

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Cyanotrichite

Cyanotrichite

Named after the Greek words kyanos, meaning “blue,” and tricha, meaning “hair,” in reference to the mineral’s common blue color and hair-like habit. Cyanotrichite is an uncommon mineral that occurs in oxidized copper sulfide deposits in localities in Romania, France, England, Italy, Greece Russia, Kazakhstan, South Africa, the United States, Chile, and quite a few others. Associated minerals include brochantite, spangolite, chalcophyllite, olivenite, tyrolite, parnauite, azurite, and malachite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cyanotrichite.pdf

Formula
Cu4Al2SO4(OH)12·2H2
Crystal System
Orthorhombic 
Crystal Habit
Druse, Acicular, Spherical 
Cleavage
Good, None, None 
Luster
Silky 
Color
sky blue, light blue, dark blue 
Streak
pale blue 
Class
Orthorhombic 
Fracture
Uneven 
Hardness
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Cyanotrichite from Grandview mine, Coconino Co., Arizona, United States

Cyanotrichite
            from Grandview mine, Coconino Co., Arizona, United States

Deep blue acicular, radial sprays to 1mm.

Deep vivid blue radial sprays to 2mm with minor Brochantite.

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