Green opal stone pebble

Weight 145 gr
Weight 145 gr
Size 60x60x35 mm
Reference 231011422
Mineral mineral Green opal
Category Objects and fossils
Group Pebbles
Country Country Madagascar Madagascar
Formula SiO2·nH2O] GREEN OPAL
O Oxygen Other no metal 53.26%
Si Silicon Metalloids 46.74%
Opal is a non-crystalline mineral from the silicate family. It consists mainly of hydrated silicon dioxide, its water content can vary from 3 to 21%. Opal is distinguished by its amorphous structure and its spectacular play of colors, the result of the diffraction of light by the microscopic silica spheres that compose it. It generally forms in cracks and cavities in rocks, mainly sedimentary rocks and volcanic rocks. Opals are classified into several types, the best known of which are precious opal, which has a play of colors, and common opal, which does not. It is mainly mined in Australia, which produces around 95% of the world's opal. Opal is often used in jewelry and is the birthstone for the month of October.

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