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Azurite has the formula Cu 3 (CO 3) 2 (OH) 2, with the copper(II) cations linked to two different anions, carbonate and hydroxide. It is one of two relatively common basic copper(II) carbonate minerals, the other being bright green malachite. Aurichalcite is a rare basic carbonate of copper and zinc. [8]
Azurite was frequently used in European Renaissance painting. It appears, for example, in the dark blue sky of a Spanish altarpiece painting by Bartolome Bermejo. [8] In this painting, azurite is also combined with lead white to paint the green robe of the Saint. [8] During this time, azurite was a common pigment used to paint a blue sky. [1]
3) 2 (OH) 2, a blue crystalline solid also known as the mineral azurite. It too has been used as pigment, sometimes under the name mountain blue or blue verditer. Both malachite and azurite can be found in the verdigris patina that is found on weathered brass, bronze, and copper. The composition of the patina can vary, in a maritime environment ...
2 if p CO 2 is less than 0.11 atm. [3] In the presence of water or moist air at 25 °C, CuCO 3 is stable only for p CO 2 above 4.57 atmospheres and pH between about 4 and 8. [8] Below that partial pressure, it reacts with water to form a basic carbonate (azurite, Cu 3 (CO 3) 2 (OH) 2). [3] 3 CuCO 3 + H 2 O → Cu 3 (CO 3) 2 (OH) 2 + CO 2
Azurmalachite is a mixture of azurite and malachite. [1] It is alternatively called azuromalachite, azurite-malachite and malachite-azurite. [2] Azurmalachite has a distinctive mottled green and blue coloration. It is relatively rare but can sometimes be found above copper deposits.
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