Polished stones - full range in stock "Malachite"

Malachite is a copper mineral of surface oxidation zones of hydrothermal deposits. It occurs mainly in the form of sinter masses of a zonal structure, which gives it a decorative appearance. But it also occurs as pseudostalactites, spherulites and acicular crystals. Once upon a time there were large reserves of malachite in the Urals, but they have all been depleted a long time ago. Currently, the largest reserves of malachite are in Africa. Compared to Russian malachite, African malachite is darker. Malachite is quite common, but it rarely forms large masses.

You can see malachite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Malachite

General
Category	Carbonate mineral
Formula (repeating unit)	Cu₂CO₃(OH)₂
IMA symbol	Mlc
Strunz classification	5.BA.10
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P2₁/a
Identification
Formula mass	221.1 g/mol
Color	Bright green, dark green, blackish green, with crystals deeper shades of green, even very dark to nearly black commonly banded in masses; green to yellowish green in transmitted light
Crystal habit	Massive, botryoidal, stalactitic, crystals are acicular to tabular prismatic
Twinning	Common as contact or penetration twins on {100} and {201}. Polysynthetic twinning also present.
Cleavage	Perfect on {201} fair on {010}
Fracture	Subconchoidal to uneven
Mohs scale hardness	3.5–4
Luster	Adamantine to vitreous; silky if fibrous; dull to earthy if massive
Streak	light green
Diaphaneity	Translucent to opaque
Specific gravity	3.6–4
Optical properties	Biaxial (–)
Refractive index	n_α = 1.655 n_β = 1.875 n_γ = 1.909
Birefringence	δ = 0.254