Malachite,

mineral from the mineral class of carbonates. He is a very desirable, but also a very soft stone. Therefore, it is stabilized with a mixture of synthetic resin and malachite dust. Malachite has only a green color.

Tenorite,

rather rare occurring mineral from the mineral group of oxides and hydroxides. It is grayish-black in color and appears brown in translucent light and gray with a golden tint in reflective light.