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Price: With the exception of the small pieces in the lower right photo (typically $5 to $15 each), most specimens are priced in the $40 to $150 range. Larger specimens (not shown) are costly and are a few hundred dollars. The malachite ashtray (lower left photo) sold for $120.
1 Chemistry: Cu2(CO3)(OH)2, Copper Carbonate Hydroxide. 2  Uses: As mineral specimens, an important ore of copper, as an ornamental stone, a pigment and for jewelry.  Malachite is a famous and very popular semi-precious stone. It is named for the Greek word for mallow, a green herb. Its banded light and dark green designs are one-of-a-kind, and give it a unique ornamental quality unlike that of any other stone.