sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, colors typically brown, red, yellow, or green due to iron impurities, dull to greasy luster, cryptocrystalline structure, conchoidal fracture with no true cleavage, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, colors typically brown, red, yellow, or green due to iron impurities, dull to greasy luster, cryptocrystalline structure, conchoidal fracture with no true cleavage, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the silica-rich precipitation in marine environments or hydrothermal solutions, often replacing organic material or filling cavities in volcanic rocks over millions of years.
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is mentioned in various historical and biblical texts.
Field identification & locations
Easily identified in the field by its waxy-to-dull luster, conchoidal fracture, and resistance to scratching by a steel knife. Found worldwide in riverbeds, mountains, and sedimentary deposits.
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