azurite


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azurite

(ăzh`ərīt), blue mineral, the basic carbonate of copper, occurring in monoclinic crystals or masses that range from transparent to translucent and opaque. It is usually associated with malachitemalachite
, a mineral, the green basic carbonate of copper occurring in crystals of the monoclinic system or (more usually) in masses. It is translucent or opaque; the luster is silky, vitreous, adamantine, or dull. It takes a good polish.
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, which it resembles except in color; when the two minerals are very closely associated, the stone is called azurmalachite. Beautiful crystals of azurite are found in the United States in Arizona and New Mexico and in France at Chessy (for which the mineral is sometimes called chessylite); they are used for ornamental purposes. The mineral is an important ore of copper.

Azurite

 

a mineral belonging to the class of carbonates. The chemical composition of azurite is Cu3[Co3]2(OH)2. Azurite crystallizes in a monoclinic system, forming tabular or prismatic crystals that are dark blue in color. It is frequently found in powdery masses, mud, and other substances (blue malachite). Its cleavability is unsure and unidirectional, and it has a bright, glasslike luster. Azurite has a hardness of 3.5–4 on the mineralogical scale and a density of 3,770–3,890 kg per cu m. It is easily dissolved in acids, with the release of carbon dioxide.

Azurite is formed on the earth’s surface by the oxidation of the primary mineral ores of copper—copper pyrites, bornite, fahlerz, and others. Minerals associated with azurite are native copper, malachite, cuprite, chrysocolla, and other minerals found in zones where copper deposits are subject to oxidation. The copper content of azurite is 55.3 percent, and it is a valuable copper ore. Azurite is also suitable for the preparation of deep blue paints.

azurite

[′azh·ə‚rīt]
(mineralogy)
Cu3(CO3)2(OH)2 A blue monoclinic mineral consisting of a basic carbonate of copper; an ore of copper. Also known as blue copper ore; blue malachite; chessylite.
References in periodicals archive ?
In addition, a small fragment of gold leaf was found on top of the azurite.
And Lyons suggested the stable's other winners, Chocolate Diamond and Azurite, should make useful hurdlers.
limonite-goethite, malachite, azurite, neotocite (Cu manganese hydroxide),
Ger Lyons runs both topweight MAGNOLIA BEACH, which separated Prince Of All and Due Diligence in his penultimate start at Dundalk, and AZURITE, which dead-heated with Breathe Easy at the Curragh.
2 m zone of low grade copper mineralization, comprising azurite and subordinate malachite, with copper wad (cuprian manganese oxide), is developed in the footwall of the vein.
I expect him to reverse earlier Curragh form with AZURITE.
The host rock in the footwall is, therefore, interpreted to represent shattered rock, with resulting void spaces subsequently infilled by copper mineralization (including azurite, subordinate malachite, possible chrysocolla) with a rind of very fine-grained quartz crystals along the margins of vugs.
zone, the copper ore consists of limonite-goethite, malachite, azurite,
Total crude oil and gas liquids production was 131,983 barrels per day in the second quarter of 2010 compared to 118,145 barrels per day in the 2009 quarter, with the 12% increase primarily attributable to production at the Thunder Hawk field in the Gulf of Mexico and at the Azurite field, offshore Republic of the Congo, both of which came on production in the third quarter 2009.
Our Azurite blue test car comes in at PS10,795 which sounds quite a lot for a Dacia until you see what comes as standard.
Strong azurite staining, with associated development of copper wad (cuprian manganese oxide), is evident over approximately 1.
The 13% improvement in oil production in the just completed quarter was primarily attributable to volumes produced at the Thunder Hawk field in the Gulf of Mexico and the Azurite field offshore Republic of the Congo, both of which came on line in the third quarter of 2009.