Azurite

AZURITE (from the French word "azur" which means azure, blue colour; named after the colour * EN: azurite; DE: Azurit, Kupferlasur; FR: azurite, bleu de montagne; ES: azurita; RU: азурит) is the mineral of the carbonate class, Cu2Cu[CO3]2(OH)2. It contains 55.3% of copper. It crystallizes in the monoclinic system, the crystalline structure is coordinated. It forms the brushes, and the drusen of the fine thick-tabular and short-prismatic, less often long-prismatic crystals. There are also characteristic the radiating aggregates, nodules, dense masses, and earthy accumulations. The colour of the crystals is dark blue, the colour of the aggregates and earthy masses is cornflower blue to light blue. The hardness is 3.5-4. The density is 3800 kilograms per cubic metre. The cleavage is perfect in the two directions. It is the typical mineral of the zone of the oxidation of the sulfide deposits of copper. It transforms into malachite during the further oxidation.

Azurite is one of the indicator minerals of the copper ores, and also the ore mineral of copper of the secondary importance, and the raw material for the preparation of the blue paint. It is beneficiated by the flotation according to the simple plans. The collectors are: the highest xanthates (after the sulphidization of the NaHS or Na2S), the fatty acids with the short hydrocarbon chain and their soaps. The desliming of the ore in advance is recommended. It is extracted from the "resistant" ores according to the method by Mostovich.