Malachite

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

Done