Welo Opal

The opal consists of hydrated silica. She can contain until 20 % of water. She is a part of the family of silicates.

Color: wide range of multicolored colors on colorless / milky tones to the deep black.
Hardness: 5.5 - 6.5
Refractive index: 1,42 - 1,47
Density: 1,95 - 2,35
Chemical composition: SiO2 * n H2O (dioxide of hydrated silicon)
Crystalline structure: amorphous
Luster: glassy; resinous, pearly, waxy, fat, matt.
Origin: Australia (the main source), Ethiopia, Mexico, Honduras, Guatemala, Brazil, the USA, Canada, Madagascar, Tanzania, the Czech Republic, Slovakia.

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