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Radiating Brochantite

The Mineral brochantite




Brochantite always occurs in a striking deep green color. It is almost exclusively in groups of small radiating needles, and almost always found together with the very similar mineral Cyanotrichite, which has a deep blue color. The combination of bright green Brochantite and bright blue Cyanotrichite creates a beautiful and contrasting specimen.
Chemical Formula CuSO4(OH)6
Composition Basic copper sulfate
Color Bright green to dark green
Streak Pale green
Hardness 3.5 - 4
Crystal System Monoclinic
Crystal Forms
and Aggregates
Very rarely in visible crystals, which are prismatic and tabular. Most often acicular, radiating, earthy, grainy, encrusting, as fibrous masses, as dense bundles of acicular crystals, and as cotton-like, radiating masses. Sometimes occurs as tiny twinned crystals that appear orthorhombic with rounded corners.

Brochantite occasionally forms a pseudomorph after Azurite and Malachite and can assume the crystal shape of those minerals.
Transparency Transparent to opaque
Specific Gravity 4
Luster Vitreous to silky
Cleavage 1,1 - pinacoidal
Fracture Conchoidal, uneven, splintery
Tenacity Brittle
In Group Sulfates; Hydrous Sulfates
Striking Features Intense green color, crystal habits, and mode of occurrence
Environment Brochantite is a secondary copper mineral formed in the oxidation zone of copper deposits.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 2
Demand (1-3) 2


Brochantite AUCTIONS
OTHER NAMES
Blanchardite



USES
Brochantite is a minor ore of copper.

NOTEWORTHY LOCALITIES
Fine African localities of Brochantite include Katanga (Shaba), Congo (Zaire); Tsumeb, Namibia; and Goulmina, Mujuram, and Touissit, Morocco. Other Worldwide occurrences are Cloncurry, Mt Isa, Queensland, Australia; the Chengmenshan Mine, Jiurui, Jiangxi Province, China; and Copiapo and Chuquicamata, in the Atacama Desert, Chile. In Mexico, Brochantite comes from the Ojuela Mine, Mapimi, Durango; and a new limited find of some of the finest examples of this mineral is the Milpillas Mine, Sonora.

Excellent specimens have also come from many areas in the southwestern U.S. Arizona localities are Bisbee, Cochise Co.; Clifton and Morenci, Greenlee Co.; and the Grandview Mine, Concino Co. Other Southwest occurrences are Bingham, Socorro Co., New Mexico; the Douglas Hill Mine, Artesia Lake, Lyon Co., Nevada; the Tintic District, Juab Co., Utah; and the Green Monster mine, Independence, and Cerro Gordo, Inyo Co., California.

COMMON MINERAL ASSOCIATIONS
Malachite, Azurite, Linarite, Cyanotrichite, Chrysocolla, Chalcopyrite, Bornite, Hematite

DISTINGUISHING SIMILAR MINERALS
Malachite - Effervesces in hydrochloric acid; otherwise practically indistinguishable from Brochantite.
Antlerite - Virtually indistinguishable from Brochantite without complex tests.
Dioptase - Crystals are not elongated like Brochantite.


brochantite PHOTOS
 
ADDITIONAL RESOURCES
 
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