Cause of Color :
Chemical Composition :
Hydrated copper carbonate – Cu2CO3(OH)2
Crystal System / Forms :
Monoclinic System / Botryoidal masses with radiating fibrous inner structure, frequently banded, acicular crystals.
Cuts & Uses :
Cabochon, beads, carvings, plaques, for inlay purposes. Sometimes cut along with the associated mineral such as azure-malachite, or along with chrysocolla.
Sub - vitreous
Curved and straight banding.
Optic Character :
Anisotropic, D.R.; Biaxial negative (generally opaque).
Refractive Index / Birefringence :
1.660 – 1.910 (Spot R.I. 1.85) / 0.250;
Simulants (with separation tests) :
Azure-malachite (structure), Synthetic Malachite (elemental analyses), Green Turquoise (structure, R.I., birefringence)
Russia, Australia, South Africa, Zambia, New Mexico.
Specific Tests :
Effervesces with cold hydrochloric acid.
First produced in Russia by the ceramic technique. Identical to the natural malachite and cannot be identified by the routine tests.
Translucent to Opaque.