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【Product Name】:Malachite
【Categories】:Copper Ore
【Item NO】:Cu (OH) 2CO3
【Specifications】:71.9% CuO, 19.9% CO2
【Document download】:Click to download

Malachite is a natural mineral, for the hydrated copper carbonate hydroxide [Cu (OH) 2CO3 or 2CuOCO2H2O], was green or grass green stone, with 71.9% CuO, 19.9% CO2, the proportion of 3.9-4.03 can be dissolved in acid. Copper is mainly used for pigment extraction and supply.

That Malachite CuCO3 Cu (OH) 2 known as patina. It is light green small particles or amorphous powder, which is the rust of copper in the air to generate the main ingredient. This powder toxic, unstable, at 473K (200 ) when the decomposition:

CuCO3 Cu (OH) 2 = 2CuO + CO2 + H2O

Decomposed into a black copper oxide. Insoluble in water but soluble in acid to the corresponding copper salt.

CuCO3 Cu (OH) 2 +4 H = 2Cu2 + CO2 +3 H2O

Decomposed into a black oxide of copper. Insoluble in water but soluble in acid to the corresponding copper salt.

CuCO3 Cu (OH) 2 +4 H = 2Cu2 + CO2 +3 H2O

In addition, also soluble in cyanide, ammonium salt can be dissolved in water and so generate ion. Two with sodium bicarbonate and copper sulfate solution by filtration, dried and mixed (low temperature) is too.

Aeruginosa is the main application system fireworks, paint, phosphorus poison antidote.

Chemical composition:

Malachite Is a copper carbonate mineral malachite (copper carbonate hydroxide), chemical compositions of Cu2 (OH) 2CO3, CuO 71.9%, CO2 19.9%, H2O 8.15%

Chemical formula: Cu2CO3 (OH) 2

 Molecular Weight: 221.12 u

Physical properties

Hardness :3.5-4 .5

Density 3.54-4.1g/cm3.

Cleavage: [201] Perfect, [010] General

Fracture: conchoidal to irregular-shaped sub-

Ductile / brittle: brittle

Streak: light green

Weight: 3.6 - 4

Solubility: soluble in strong acid, methanol; case of hydrochloric acid react, and easy to dissolve

Optical properties

Refractive index 1.66-1.91, double refractive index of 0.25, multicolor and colorless - yellow and green - dark green.

Color: green, dark green

Luster: No, glass or silk gloss

Transparency: translucent until opaque

Structure and Form

Crystal system: monoclinic

Crystal addiction: needle, plate, grape-like or bell emulsion

Monoclinic system. Columnar or needle-like crystal form often has very few, usually crystal bell was hidden emulsion, bulk, hull shape, nodular and fibrous aggregates. With concentric layered, fiber radial structure. Green, malachite green, dark green and so on. Frequent pattern belt, silk shiny or glass gloss, it seems clear to opaque

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