Malachite, Cu2CO3(OH)2 (Copper Carbonate Hydroxide), is a well known and popular semi-precious stone and is named after the Greek word for "mallow", a green herb. The banded light and dark green designs give it a unique ornamental quality unlike that of any other stone. The bands and colour are so distinctive that malachite is one of the most easily recognised minerals by the general public.

Description: An unusual specimen of malachite whose form resembles that of a sponge. There are numerous openings and hollows in the body of the specimen, many lined with shiny needle-like crystals of dark green malachite. Where these are well exposed they have a very bright glassy luster. Otherwise the main part of the mineral has an earthy look and texture. A nice display specimen.

Location: Katanga, Dem Rep of Congo.