sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, reddish-brown color with intricate patterns, vitreous to dull luster, cryptocrystalline or microcrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, reddish-brown color with intricate patterns, vitreous to dull luster, cryptocrystalline or microcrystalline crystal structure, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often associated with iron-rich deposits. Geological age varies widely depending on the specific location.
Uses & applications
Used for ornamental objects, cabochons, carvings, jewelry, and by collectors.
Geological facts
Jasper has been used throughout history since ancient times for seals, talismans, and decorative items. Its rich red and brown colors are typically due to iron oxide impurities.
Field identification & locations
Found worldwide in riverbeds, beaches, and mountainous regions, easily identified by its hardness, conchoidal fracture, and opaque, patterned appearance.
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