mineral
Prase Opal
Hydrated amorphous silica (SiO2·nH2O)
AI-generated identification · may be incorrectHardness 5.5-6.5 on Mohs scale, leek-green to olive-green color, vitreous to greasy luster, amorphous crystal structure, conchoidal fracture.
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Physical properties
Hardness 5.5-6.5 on Mohs scale, leek-green to olive-green color, vitreous to greasy luster, amorphous crystal structure, conchoidal fracture.
Formation & geological history
Formed at low temperatures from silica-rich water solutions depositing in cavities and fissures of rocks, predominantly during the Cenozoic era.
Uses & applications
Used primarily in lapidary arts, cabochons, carved ornaments, and as a collectible gemstone specimen.
Geological facts
The green color is typically caused by inclusions of nickel or green clay minerals within the amorphous silica matrix.
Field identification & locations
Identified by its distinct green hue, lack of cleavage, conchoidal fracture, and lower hardness than quartz; found globally in regions with volcanic activity.
