|
Chemical formula
|
SiO 2 •nH 2 O |
|
Crystalline System
|
Amorphous |
|
Class
|
Silicates - Mineraloid |
| Origin | Madrid Spain |
| Size |
Medium: 3.00-4.00 cm Large: 4.00-5.00 cm |
Massive Opal with various shades and colors.
It has a composition similar to that of quartz, from which it differs because it has water molecules inside. They are very frequently 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, since the minerals are natural and no pieces are identical. The size is approximate.