gemstone
Olive Opal
Hydrated amorphous silica (SiO2·nH2O)
AI-generated identification · may be incorrectHardness of 5.5-6.5 on the Mohs scale, earthy olive green to brownish color, vitreous to greasy luster, and amorphous crystal structure.
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Physical properties
Hardness of 5.5-6.5 on the Mohs scale, earthy olive green to brownish color, vitreous to greasy luster, and amorphous crystal structure.
Formation & geological history
Formed from silica-rich solutions deposited at low temperatures in cavities of sedimentary and volcanic rocks.
Uses & applications
Used primarily in lapidary work, decorative carvings, and metaphysical crystal collecting.
Geological facts
Olive opal gets its unique greenish-brown hue from microscopic inclusions of various minerals like nickel or iron oxides.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and characteristic olive coloration; sourced mainly from Madagascar, Peru, and the western United States.
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