sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, varying colors including yellow, red, brown, and green, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, varying colors including yellow, red, brown, and green, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids replace original material or precipitate in cavities. Found in various geological environments worldwide.
Uses & applications
Used primarily for ornamental objects, cabochons, jewelry, carvings, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, referenced in many historical and biblical texts.
Field identification & locations
Easily identified in the field by its opacity, smooth water-worn surface when found in rivers or beaches, and hardness that scratches glass. Common worldwide.
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