Quartz, Onyx & Zinc

Gemstone Name: Quartz, Onyx & Zinc
Location: Arizona
Characteristics: This striking cabochon is a compressed stone composed of small chunks of white Quartz and black Onyx, to which zinc has been added. The material is then heated and compressed, creating a beautiful, vivid stone.
Hardness: 5
Size: 32mm x 30mm & 4mm thick. 
Polish: Excellent