sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, red, yellow, and green, trigonal crystal system with a microcrystalline structure, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown, red, yellow, and green, trigonal crystal system with a microcrystalline structure, and conchoidal fracture.
Formation & geological history
Formed from silica-rich sediments or volcanic ash, often deposited in marine or lacustrine environments and consolidated over millions of years through diagenesis.
Uses & applications
Used in ornamental carvings, cabochons for jewelry, decorative objects, and as a polishing stone.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and various ornaments, highly prized by ancient civilizations such as the Greeks, Romans, and Egyptians.
Field identification & locations
Identified by its opaque nature, waxy to dull luster, and ability to take a high polish. Commonly found in riverbeds, alluvial deposits, and mountainous regions worldwide.
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