Sulfates: brochantite
Diagnostic Card.
Cu SO 4 (OH) 6
Crystal system monoclinic
Hardness of 3.5-4
The share of 4
Cleavage is perfect
Green colour
Color in light green powder
Gloss glass
Look brochantite units is extremely variable: they can be a solid granular mass, and can form fine needles Druze. Brochantite presented elongated prismatic crystals, aggregates of needles, solid or granular masses, crusts. Its color is always either emerald or dark green. It is often associated with azurite, tenorite, cuprite, cerussite, atacamite, chrysocolla, linaritom.
Chemical composition - content (%): CuO - 69 - 71; Of SO3 - 17 - 18.3; H2O - 11 - 14. Luster - glass, pearl on several cleavage planes. Crystal system - Monoclinic; prismatic - 2 {t. Cleavage - by {100} perfect. Aggregates - Tolstoprizmatichesky to needle on [001], sometimes elongated along the [010] or, more rarely, in [100]; and tabular on {001}. In a weakly fused aggregates of needle-like crystals; Group drusy and crusts; dense, granular.
Diagnostic features.
At first glance brochantite be confused with malachite, with whom he often found together. But unlike malachite brochantite carbonate and is, as such, it responds to the action of boiling acids. Behavior in acid - is dissolved.
Origin.
Distributed in the zone of oxidation of copper deposits.
Deposits and application.
Brochantite identified in many places, the most important of them: Bisbee, Cochise County (Arizona), Tintik (Utah), county-Aisne Don (New Mexico, United States); Tsumeb in Namibia; Numerous mines in Shaba (Zaire); in Chuquicamata, Papozo, Potrerilos, Chalakolo (Chile); Broken Hill (Australia); many places in Sardinia, including Rosas and La Dyuchessa where brochantite much and where he meets with aurihaltsitom, malachite, chrysocolla. Used as copper ore.
Tsianotrihit, brochantite. Kounrad, Balkhash, Kazakhstan. Photo: © AA Evseev.
Tsianotrihit, brochantite. Grand View Mine, Arizona, USA. Photo: © AA Evseev.
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