0

Opal | ‪#‎Geology‬ ‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Formula: SiO2 • nH2O
Colour: Colorless, white, various
Hardness: 5½ - 6½

Opal "Pineapples" - an opal pseudomorph formed by the replacement of glauberite by opal - found only in New South Wales.

photo: Grant Pearson

Post a Comment

 
Top