Opal (var. Black Opal)
Australia - Oceania
SiO2•nH2O
Description
Slab of black precious opal weighing 254 carats, 7.1 cm wide and 0.7 cm thick. The dominant colors are green, dark blue with hits of orange / gold, and the patterns are reminiscent of peacock feathers.
Lightning Ridge, Walgett Shire, New South Wales
Probable extraction year
1995
From the Sanskrit upala, meaning precious stone.
Class
8 - Silicates / Tectosilicates
Dimensions (length x with x height in cm)
6x7.5x1
Hardness (Mohs)
5.5
Density (G/cm3)
2
Publication
"101 Minéraux et Pierres Précieuses qu'il faut avoir vus dans sa vie", "Minéraux - Le Guide des Passionnés"
