mineral
Prase Opal
Hydrated amorphous silica (SiO2·nH2O) with nickel impurities
AI-generated identification · may be incorrectHardness of 5.5-6.5 on the Mohs scale, vibrant yellow-green to leek-green color, vitreous to greasy luster, amorphous crystal structure with conchoidal fracture.
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Physical properties
Hardness of 5.5-6.5 on the Mohs scale, vibrant yellow-green to leek-green color, vitreous to greasy luster, amorphous crystal structure with conchoidal fracture.
Formation & geological history
Formed at low temperatures from silica-rich groundwater solutions depositing in cavities and fissures, often associated with serpentine or volcanic rocks.
Uses & applications
Used primarily as a decorative lapidary stone for cabochons, carvings, and mineral collections.
Geological facts
The characteristic green color is caused by trace amounts of nickel or iron inclusions within the amorphous silica matrix.
Field identification & locations
Identified by its distinctive apple-green color, lack of cleavage, and waxy luster; found in locations such as Poland, Australia, and the USA.
