atacamite


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atacamite

[‚ad·ə′kam‚īt]
(mineralogy)
Cu2Cl(OH)3 Native, green hydrouscopper oxychloride crystallizing in the orthorhombic system.
References in periodicals archive ?
The DPG Phase II research indicated that, not only was seismic pumping a viable mechanism, but that it might also provide an alternative explanation for the formation of atacamite [[Cu.
Copper minerals are atacamite and brochantite in the oxide zone; chalcocite, covellite, and pyrite in the enriched zone; and chalcopyrite, bornite, molybdenite, tennantite, and pyrite in the hypogene zone.
In a zone 50 m below the water table, atacamite has been removed, and replaced by other copper minerals (Cuadra and Rojas 2001).
Atacamite has been considered to be a primary product of supergene oxidation, both generally in the region (Chavez 2000), and specifically for this deposit (Arcuri and Brimhall 2003).
2008), using samples from Spence and Mantos Blancos, demonstrated that the salinity of fluid inclusions in atacamite overlaps that of the local groundwater (Fig.
2005) also report salt efflorescences at the surface along major faults; in places, these efflorescences have a green colouration that was shown (by X-ray diffraction) to be related to the presence of atacamite and chalcantite.
If atacamite forms by seismic pumping of saline groundwater to surface, the implication is that this mineral may be young, potentially much younger than other supergene copper minerals in the oxide zones of copper deposits in the Atacama Desert.
An origin for atacamite that links it to seismically pumped saline groundwater is consistent with our fluid inclusion studies of atacamite from several deposits in northern Chile, and with U--Th disequilibrium age dating of gypsum intergrown with fracture-zone atacamite.
2003, The chloride source for atacamite mineralization at the Radomiro Tomic porphyry copper deposit, Northern Chile: Economic Geology, v.
It consists mainly of brochantite and a basic copper chloride called atacamite, CuCl.
Copper oxide mineralization consists of atacamite, malachite and chrysocolla.
The mineralization present is in the form of tenorite, cuprite, native copper, malachite, azurite and atacamite.