Malachite and Iron carbonate

Category: Carbonate mineral

Chemical formula: Cu2CO3(OH)2

Strunz classification: 05.BA.10

Crystal system: Monoclinic—prismatic H-M Symbol (2/m) Space group P21/a

Mohs scale hardness: 3.5–4.0

Specific gravity: 3.6–4

Optical properties: Biaxial (–)

Refractive index: nα = 1.655 nβ = 1.875 nγ = 1.909

Birefringence: δ = 0.254

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