Specimens of malachite from the Congo, Africa. Malachite is a copper mineral which has long been used by humans as a source of copper, it is easily recognisable due to its green colouration.The mineral forms deep underground, often fractures or spaces where the water table and hydrothermal fluids provide the means for chemical precipitation, leaving malachite veins or pockets behind. It has pre-historically been used as a paint pigment and is a major source of copper ore as well as in gemstone and jewellery products. These samples are a vibrant green colour and usually show some amount of banding and are a must have for any mineral collection. Specimens are supplied in a white card tray with an information label.