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
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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