Malachite

Malachite
Chemical composition	Cu2(CO3)(OH)2
Colors	Banded light and dark green
Crystal system	Monoclinic
Habit	Botryoidal, stalactitic, globular
Cleavage	Distinct
Fracture	Conchoidal, splintery
Hardness	3.5-4
Optic nature	Biaxial -
Refractive index	1.655 - 1.909
Birefringence	0.254
Dispersion	Weak
Specific gravity	3.60 - 4.05
Lustre	Dull, silky, vitreous
Transparency	Translucent to opaque
Pleochroism	None
Sources	Australia, Namibia, Russia, USA, Zambia, Zaire

Sources

• Gemstones - Properties, identification and use (2008) - Arthur Thomas ISBN 9781845376024