Superbe Opal Cabochon

Opal as well as Opal Cabochon

Formula: SiO2 · nH2O
Colour:Colorless, white, diverse
Hardness:5½ – 6½

From: Queensland, Australia
Size: 7cm (Opal), 7mm (Opal cabochon)


Sumber http://www.geologyin.com