Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
Minerals V2 banner 160x600

Advertising Information

Cyanotrichite Cavity

The Mineral cyanotrichite

Cyanotrichite is a lovely blue mineral with very characteristic radiating needle aggregates. It is an extremely fragile mineral, and handling should be avoided, for even a slight touch can destroy a crystal grouping. Cyanotrichite crystals will rub off and leave a blue residue of tiny crystals on a surface if handled.
Chemical Formula Cu4Al2SO4(OH)12 · 2H2O
Composition Basic hydrous copper aluminum sulfate
Color Bright blue
Streak Light blue
Hardness 1 - 3
Crystal System Orthorhombic
Crystal Forms
and Aggregates
As scattered groups of radiating or acicular crystals. Also occurs in ball-like aggregates of tiny, slender crystals, as plush, wool-like needle groupings, and as crusty groupings of tiny needles.
Transparency Translucent
Specific Gravity 2.7 - 2.8
Luster Silky
Cleavage None
Fracture Splintery
Tenacity Brittle
In Group Sulfates; Hydrous Sulfates
Striking Features Crystal aggregates and bright blue color
Environment As a secondary mineral found in the oxidation zone of copper deposits.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 3

Cyanotrichite AUCTIONS
Velvet Copper Ore

 -  A carbonate-rich variety of Cyanotrichite, where the sulfate radical (SO4) is partially replaced by a carbonate radical (CO2). Its chemical formula is Cu4Al2(CO3,SO4)(OH)12 · 2H2O. Carbonatecyanotrichite is technically not really a variety since it is scientifically recognized as as a distinct mineral species, though it is identical to Cyanotrichite and virtually indistinguishable.

Cyanotrichite is a rare mineral, thus it is a very insignificant ore of copper. It is popular as a micromount mineral.

European localities for Cyanotrichite include Cap Garonne and Salsigne, France; Wheal Basset, Cornwall, England; and Lavrion, Greece. One of the best producers of this mineral is in the Vieja Mine in Potrerillos, Chanaral Province, Chile. Good Cyanotrichite also comes from Qinglong, Guizhou Province, China.

In the U.S., Cyanotrichite has several good localities in Arizona, specifically the Grandview Mine near the Grand Canyon, in Concino Co.; the Copper Queen Mine in Bisbee, Cochise Co.; and the Maid of Sunshine Mine, Cortland, Cochise Co. Cyanotrichite also comes from the American Eagle Mine in the Tintic District in Juab Co., Utah; the Peacock Mine, Lemhi Co., Idaho; and the Majuba Hill mine, Pershing Co., Nevada.

Malachite, Azurite, Brochantite, Smithsonite

Aurichalcite - Greener color.
Azurite - Usually darker blue.

cyanotrichite PHOTOS
DISCUSSIONView Forum | Post to Forum
Have a question about Cyanotrichite? Visit our Q&A Community and ask the experts!

To sponsor this page, click here.

Let us know how we can update this page
(Click for more details)
We strive for accurate content and locality information. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. If you are requesting a locality be added, please only include significant locality occurences for the mineral.