Chrysocolla


Also found in: Dictionary, Wikipedia.

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 ?
Oxide mineralization consists of malachite, chrysocolla, azurite, cuprite, native copper and occasional limonite.
Dense quartz stockwork development is associated with malachite, azurite, minor cuprite, chrysocolla, chalcocite and rare, unoxidised sulphides.
Oxide mineralization is characterized by malachite, chrysocolla, azurite, cuprite, minor neotocite and native copper and is developed to a depth of 265m followed by a transitional mixed oxide-sulphide zone to 310m depth.
Oxide mineralization comprises cuprite, malachite, azurite and chrysocolla.
Oxide mineralization comprises minor cuprite, azurite, malachite and chrysocolla.
Leachable copper minerals include chrysocolla, atacamite, brocanthite, malachite, and iron-copper oxides (wad).
Two drills continue to operate on the Longshot Ridge copper oxide cap which consists mainly of chrysocolla with lesser amounts of malachite, copper wad and azurite mineralization.
Two drill rigs recently completed testing on the Longshot Ridge ("LSR") zone which is predominantly copper oxide mineralization, consisting mainly of chrysocolla with lesser amounts of malachite, copper wad and azurite mineralization.
Naturally, there's my all-time favorite gem, chrysocolla.
32% copper), is present as malachite and chrysocolla clasts within Kalahari clay, and in quartzite clasts with interstitial disseminations of malachite.
The breccias contain strongly silicified and sericitized angular clasts of volcanic and plutonic rocks set in a vein matrix of quartz, tourmaline, iron oxides (dominantly hematite), and occasional chrysocolla.
The copper mineralization consists predominantly of secondary copper minerals such as malachite, azurite, chrysocolla and copper wad (oxide) with minor chalcopyrite and bornite.