|
Chemical formula
|
SiO2 • nH2O |
|
Crystalline system
|
Amorphous |
|
Class
|
Silicates - Mineraloid |
| Origin | Broken Hill, Australia |
| Size |
Medium: 3.00-4.00 cm Large: 4.00-5.00 cm |
Massive Opal in green and brown tones.
It has a composition similar to that of quartz, from which it differs because it has water molecules inside. Very often they are found filling cavities of rhyolites or sedimentary rocks. There are numerous varieties of opal that have different appearances.
The piece you receive may differ slightly from the photo shown as the minerals are natural and no piece is identical. The size is approximate.