sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster (vitreous to dull), concoidal fracture, variable colors including red, green, yellow, and brown due to iron and other mineral impurities.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster (vitreous to dull), concoidal fracture, variable colors including red, green, yellow, and brown due to iron and other mineral impurities.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids precipitate microcrystalline quartz in pore spaces or fractures. Can vary in geological age.
Uses & applications
Used for ornamental carvings, decorative objects, cabochons in jewelry, and prized by lapidary collectors.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, highly valued by ancient civilizations like the Egyptians and Greeks.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and mountainous regions. Identified by its opacity, hardness, and varied earthy color patterns.
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