Malachite

Physical Properties
Chemical formula Cu2CO3(OH)2
Class Carbonate
Crystal system Monoclinic
Habit Usually massive
Frequently colloform or banded
Botryoidal
Mammillary
Color Bright green
Hardness 3.5 to 4
Specific gravity 3.7 to 4
Cleavage Perfect (201)
Fracture Subconchoidal
Luster Vitreous
Silky
Dull
Transparency Translucent to opaque
Streak Pale green
Optical Properties
PPL Bright green
Non-pleochroic
XPL Bright green
δ 0.254
after Perkins, 388

Malachite in Hand Sample

Malachite

Green malachite and blue azurite

Malachite in Thin Section

Thin Section GigaPans

Malachite, plane polars

Malachite, crossed polars

Malachite, PPL
Malachite, XPL

Further Reading

Malachite at webmineral.com

Malachite at mindat.org