Zebra Onyx Starfish Chemical Formula: Cu3(CO3)2(OH)2 & Cu₂CO₃(OH)₂

Chemical Formula: Cu3(CO3)2(OH)2  & Cu₂CO₃(OH)₂

There are many minerals that take this form

Chemical Formula: {Ca2}{Mg5}(Si8O22)(OH)2

You will receive the specimen pictured

Zebra Onyx Starfish Chemical Formula: Cu3(CO3)2(OH)2 & Cu₂CO₃(OH)₂How cool is this carving. Add a little flair to your collection with this cute little one. Size: ~4. 0 in. Weight: 3. 0 oz Onyx is a variety of silicate minerals similar to agate. The primary difference is the formation of the chalcedony bands. Agates show curved banding while onyx shows parallel banding. The word onyx comes from the ancient Greek word "" meaning claw. The uses of onyx for jewelry, tools, and art can be traced back almost 5000 years.