Opal (var. White Opal)
Australia - Oceania
SiO2•nH2O
Description
Blade of white polychrome opal (103 carats) cut into an oval, or which the polished upper face exhibits a play of bright and sparkling colors. The lower part is milky white.
Coober Pedy, South Australia
Probable extraction year
1970
From the Sanskrit upala, meaning precious stone.
Class
8 - Silicates / Tectosilicates
Dimensions (length x with x height in cm)
4x7x1
Hardness (Mohs)
5.5
Density (G/cm3)
2
Publication
"Minéraux - Le Guide des Passionnés"
