Malachite 12-17x16-21mm A Grade Small Free Form Cabochon Stone Type_Porcelain Jet is a mineraloid gemstone

Jet is a mineraloid gemstone

also known as Blue Ice Glacierite or Blue Ice Nakaurite

it lightens because of further weathering and becomes Malachite

is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals

The name "biotite" is used because these minerals generally cannot be distinguished without optical

Malachite 12-17x16-21mm A Grade Small Free Form Cabochon Stone Type_Porcelain Jet is a mineraloid gemstoneMalachite is a copper carbonate with a bright green color and dark green banding. Usually found near copper deposits, it is formed through the combination of carbonated water, limestone and copper. Famous malachite mines in the Ural mountains of Russia once produced 20 to ton blocks of the stone, while today it is primarily mined in Africa. Malachite was used extensively as decoration in the palaces of Russian tsars and forms the columns of St. Isaacs