Azurite (Azruite)
(also known as Shi Qing)
[Chemical composition] The composition is quite stable.
[Crystal structure] monoclinic system; 
; a 0 = 0.500 nm, b 0 = 0.585 nm, c 0 = 1.035 nm; β = 92 ° 20'; Z = 2.
[Form] The crystal is often in the form of a short column, a column or a thick plate. The aggregate is a dense block, a cluster, a radial, a soil or a shell, a film, etc. (Fig. H-13).
FIG H-13 blue crystals of copper mineral aggregate
[Physical properties] Dark blue, soil-like block is light blue; light blue streak; crystal is glassy luster, earthy block is earthy luster; transparent to translucent. Cleavage {011}, {100} complete or medium; shell-like fracture. Hardness 3.5 to 4. The relative density is 3.7 to 3.9. Crisp.
[genesis and occurrence] is produced in the cracks of the copper deposit oxidized zone, iron cap and near-rock surrounding rock. It is a secondary mineral, often associated with malachite symbiotic or associated, and its formation is generally later than malachite, but Sometimes it is explained by malachite. Due to the weathering effect, the azurite is reduced in CO 2 , and the water content is easily converted into malachite, and even the malachite-blue copper deposit is false.
Like, the distribution of azurite is not as extensive as malachite.
[identification characteristics] blue. Often associated with copper oxides such as malachite. Foaming with HCl. There is a flame reaction of Cu.
[Main use] with malachite.
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