sedimentary
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
Hardness of 6.5-7 on the Mohs scale, various earth-tone colors including brown, green, yellow, and red, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture with no cleavage, specific gravity of 2.58-2.91
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Physical properties
Hardness of 6.5-7 on the Mohs scale, various earth-tone colors including brown, green, yellow, and red, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture with no cleavage, specific gravity of 2.58-2.91
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or volcanic ash beds, often during ancient hydrothermal activity or silica replacement of organic material over millions of years
Uses & applications
Used in ornamental carvings, cabochons, jewelry, decorative objects, and by lapidary hobbyists
Geological facts
Jasper has been used since antiquity for ancient seals, talismans, and decorative items. Its name comes from the ancient Greek word for 'spotted stone'
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy to dull luster, opaque appearance unlike translucent chalcedony or agate, and conchoidal fracture. Commonly found in riverbeds and areas with ancient volcanic or sedimentary activity
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