sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically brown, red, yellow, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically brown, red, yellow, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed in silica-rich environments, often through the precipitation of silica from aqueous solutions or hydrothermal fluids within sedimentary or volcanic rocks.
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and decorative objects.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, with mentions dating back to antiquity across various civilizations.
Field identification & locations
Found worldwide in riverbeds, sedimentary deposits, and volcanic regions. Identified by its hardness, opacity, and smooth, water-worn shape when found as a pebble.
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