Malachite although sometimes used for jewelry, is now more largely
employed for mosaic work and ornamental vases, and is sufficiently
costly and rare to be classed amongst the precious stones.
Malachite is 3.5 to 4 in hardness; has a specific gravity of 3.6 to 4;
is translucent to opaque; the lustre is vitreous to adamantine. It is
attacked by acids, and melts before the blow-pipe. It is composed of:
Carbonic acid 20.
Protoxide of copper 71.8
Water 8.
Malachite occurs in emerald or verdigris green color, sometimes in
alternating stripes of different shades of green, and occasionally in
leek- to blackish-green.
Malachite is found in Russia, France, the Tyrol, England, Scotland,
Ireland, Germany, Africa, Chili, Australia, and the United States.
The finest specimens are found in the Urals—a block three and a half
feet square, being valued at 525,000 roubles.