Chrysocolla


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chrysocolla

[‚kris·ə′käl·ə]
(mineralogy)
CuSiO3·2H2O A silicate mineral ordinarily occurring in impure cryptocrystalline crusts and masses with conchoidal fracture; a minor ore of copper; luster is vitreous, and color is normally emerald green to greenish-blue.

Chrysocolla

 

a mineral; a hydrous copper silicate, with the composition Cu8[Si4O10]2(OH)12· nH2O, where n = 8 or more rarely 0 or 4. Chrysocolla crystallizes in the orthorhombic system. It occurs in the form of cryptocrystalline, opal-like, enamel-like, or earthy aggregates and sinter crusts. The color is bright turquoise or bluish green. Dense concretions with malachite and halloysite occur frequently. Chrysocolla has a hardness of 2–4 on Mohs’ scale and a density of 2,200–2,300 kg/m3. A common mineral in the oxidation zone of copper deposits, it indicates the presence of copper ore.

Chrysocolla has been found in Chile, the United States, and elsewhere. In the USSR it occurs in the Urals, Transbaikalia, and Kazakhstan.

References in periodicals archive ?
The results indicate that oxidized copper minerals--corresponding to malachite, chrysocolla and brochantite--were primarily used in the furnaces.
From these preliminary data, as well as the radiating fibrous texture and deep blue colour seen in our samples, it appears that bisbeeite indeed differs from chrysocolla and needs to be better defined.
Economic ore types in both deposits can be classified into four major groups: primary sulphides (chalcopyrite and bornite); secondary sulphides (chalcocite, chalcopyrite, bornite, and covellite); oxides (chrysocolla, brochantite); and a mixture of oxide and sulphide.
Native copper, chrysocolla and azurite, although less abundant, also occur.
Among the minerals used for making jewelry were chrysocolla and turquoise.
The mineralogy of the milled Haib feed revealed over 98.5% Chalcopyrite, 1% Bornite, and less than 0.5% of Chalcocite, Covellite, Malachite and Chrysocolla.
On initial observation, it appeared to be composed of azurite and chrysocolla because of its patchy blue coloration and the presence of some green areas (Figure 11, left).
Several secondary copper minerals like malachite, chrysocolla and turquoise were also common.
Completely Oxidised (top 25-35 metres) - to an iron oxide-quartz fragment gossan/ironstone with local malachite - atacamite - chrysocolla - cuprite mineralisation.
Chrysocolla [(Cu,Al).sub.2][H.sub.2][Si.sub.2][O.sub.5][(OH).sub.4].[nH.sub.2]O
Later carbonate and silica-enriched hydrothermal fluids gave rise to the malachite and chrysocolla and were also responsible for the limonitisation.
The IM-001828 rock sample contained visible malachite, chrysocolla and Fe-oxides.