sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, multicolored (often featuring reds, browns, yellows, and greens due to iron oxides), conchoidal fracture, and a specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, multicolored (often featuring reds, browns, yellows, and greens due to iron oxides), conchoidal fracture, and a specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich solutions in sedimentary environments or hydrothermal veins, often accumulating in silica-rich oozes on ocean floors or within volcanic cavities.
Uses & applications
Commonly used for ornamental carvings, polished cabochons in jewelry, spheres, and as a popular specimen for rock collectors and lapidary artists.
Geological facts
Jasper has been prized since ancient times for talismans and seals, and historically featured in various ancient civilizations including Minoan Crete and ancient Egypt.
Field identification & locations
Can be identified in the field by its waxy luster, conchoidal fracture, opaque appearance, and high hardness which scratches glass. Found worldwide, particularly in regions with significant volcanic or sedimentary deposits.
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