sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5-7 on the Mohs scale, with a waxy to dull luster and conchoidal fracture. Displays opaque reddish, brownish, or multicolored banding due to iron impurities.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, with a waxy to dull luster and conchoidal fracture. Displays opaque reddish, brownish, or multicolored banding due to iron impurities.
Formation & geological history
Formed through the silification of sedimentary or volcanic deposits, often precipitating from silica-rich hydrothermal fluids or chemical precipitation in marine environments.
Uses & applications
Commonly used for ornamental carvings, polished cabochons, lapidary art, and low-cost jewelry or decorative landscaping stones.
Geological facts
Jasper has been used since ancient times for tools, seals, and talismans, and is frequently mentioned in ancient lapidary texts. It is a variety of chalcedony.
Field identification & locations
Easily identified by its opaque nature, hardness, and smooth conchoidal breakage. Found worldwide, particularly in areas with historical volcanic or sedimentary activity.
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