Smithsonite

Smithsonite is usually found as bluish green or green botryoidal masses or soft layers, which are polished and used as an ornamental stone (sometimes called bonamite). It may also be colored pink by cobalt, or yellow by cadmium. Crystals may also be found, but they are faceted for the collector only.

Colorless crystals in Namibia and Zambia; blue-green masses in the United States, Spain, and Greece; yellow in the United States and Sardinia.

Smithsonite Properties

Chemical Composition: 
Zinc carbonate
Crystal System / Forms: 
Trigonal
Hardness: 
5
Specific Gravity: 
4.35
Lustre: 
Pearly.
Refractive Index / Birefringence: 
1.62-1.85 / 0.230
Cuts & Uses: 
Cabochon.