| This is a common mineral with many forms. Pictured above is Iceland spar. This clear calcite is also known as optical calcite. It is valued for its unique light refracting qualities. | Malichite is a copper carbonate mineral. It usually form as a tarnish on copper ore. It is valued for its rich green color and is used in jewelry and ornamentals. | Rhodochrosite is a manganese carbonate mineral. In its purest form it is a transparent rose red, but this is fairly rare. It can also be formed in stalactites. |