gemstone
Ethiopian Opal
Hydrated amorphous silica (SiO2·nH2O)
AI-generated identification · may be incorrectMohs hardness of 5.5 to 6.5, highly variable play-of-color including orange, yellow, and purple hues, sub-vitreous to resinous luster, amorphous crystal structure with no cleavage.
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Physical properties
Mohs hardness of 5.5 to 6.5, highly variable play-of-color including orange, yellow, and purple hues, sub-vitreous to resinous luster, amorphous crystal structure with no cleavage.
Formation & geological history
Formed from silica-rich solutions percolating through volcanic ash beds over millions of years, primarily originating from the Welo province in Ethiopia.
Uses & applications
Extensively used in jewelry making for rings, pendants, and earrings, as well as highly prized by mineral and gemstone collectors.
Geological facts
Ethiopian opals are typically hydrophanous, meaning they can temporarily absorb water and change their transparency and play-of-color.
Field identification & locations
Easily identified by their characteristic play-of-color and lightweight feel; commonly found in clay-rich volcanic strata in East Africa.
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