sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, varies in color including red, brown, yellow, and green due to iron oxide impurities, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, and specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, varies in color including red, brown, yellow, and green due to iron oxide impurities, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture, and specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary basins or volcanic environments, often involving the precipitation of silica in spaces within rocks or replacement of organic material over millions of years.
Uses & applications
Used frequently in lapidary arts, making cabochons, beads, decorative carvings, and occasionally as a gemstone.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, with mentions dating back to antiquity across various civilizations.
Field identification & locations
Can be identified in the field by its smooth, water-worn texture when found in streams, opaque appearance, hardness that scratches glass, and waxy luster on broken surfaces. Found worldwide.
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