sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, opaque with varied earthy colors, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, opaque with varied earthy colors, conchoidal fracture.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, often precipitating from silica-rich hydrothermal fluids or silica-rich groundwater in ancient marine basins.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, jewelry making, and as a popular specimen for rock collectors.
Geological facts
Jasper has been utilized by ancient peoples globally since the 4th millennium BC for making tools, seals, and ritual ornaments.
Field identification & locations
Easily identified by its opaque nature, high hardness scratching glass, and smooth conchoidal breakage. Highly plausible in the glaciated terrain of northern Minnesota.
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