antlerite


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antlerite

[′ant·lə‚rīt]
(mineralogy)
Cu3SO4(OH)4 Emerald- to blackish-green mineral occurring in aggregates of needlelike crystals; an ore of copper. Also known as vernadskite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Is Hauy's "cuivre sulfate" then chalcanthite, brochantite or antlerite? What is "cuivre gris" that is treated by Hauy as an isomorph of "cuivre pyriteux"?
The original deposit possessed a leached capping of oxide ore averaging some 27 m in thickness, the principal minerals being malachite, azurite, cuprite, tennantite, brochantite, antlerite and chrysocolla.
However, scientists noticed in 1986 that the surface also contained lots of a sulfur-enriched mineral called antlerite ([Cu.sub.3][(OH).sub.4][SO.sub.4]), which dissolves and washes away more easily than brochantite, exposing the darker layer below (SN: 12/20 & 27/86, p.392).
A dealer may advertise antlerite as a rare species but fail to mention that at Chuquicamata, in northern Chile, home of the largest open-pit copper mine in the world, antlerite is a common ore mineral.
X-ray diffraction studies show thatthe green patina consists largely of two basic copper sulfates: brochantite, CuSO.sub.4..3Cu(OH).sub.2., and antlerite, CuSO.sub.4..2Cu(OH).sub.2.
Green acicular crystals of antlerite coating quartz were found on upper levels of the Salvadora vein (Bandy, 1944).
Baboian's results suggest that acid rain may be converting a stable form of basic copper sulfate called brochantite, CuSO4 3Cu(OH)2, which formed naturally on the statue's copper surface, into a less stable form of copper sulfate called antlerite, CuSO4 2Cu(OH)2.
A single amazing specimen which emerged from the find consists of a discrete, gemmy red cuprite crystal, 2.6 cm on edge, sitting up smartly on a green bed of antlerite microcrystals over massive cuprite: this incredible specimen was the talk of the 1987 Tucson show, and was published on the cover of vol.
Imagine their joy when they broke into a treasure pocket containing an amazing, totally gemmy, 1-inch cuprite crystal sitting on antlerite. The boulder eventually yielded some 20 different species but the prize was the finest cuprite in the world.
Associated minerals are: gypsum, cuprite, antlerite, goethite, lepidocrocite, mbobomkulite, hydrom-bobomkulite, sklodowskite and two undefined uranium minerals.
Antlerite [[Cu.sup.2+].sub.3]([SO.sub.4])[(OH).sub.4]
Conversely, a number of species occurring at the Blanchard mine (antlerite, cinnabar, hydrozincite, sulfur, mottramite, otavite, and cuprite) have not been found at the Mex-Tex mine.