sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red to brown color with vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, red to brown color with vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary or volcanic environments, often involving iron oxide impurities that create the reddish-brown coloration.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name comes from the ancient Greek word iaspis, meaning 'spotted stone'.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy luster, opaque nature, and conchoidal fracture. Commonly found in riverbeds, hydrothermal veins, and sedimentary rock formations worldwide.
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