sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5-7; deep red, brown, or variegated color; waxy to dull luster; massive crystal habit with no visible cleavage.
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Physical properties
Mohs hardness of 6.5-7; deep red, brown, or variegated color; waxy to dull luster; massive crystal habit with no visible cleavage.
Formation & geological history
Formed via the precipitation of silica-rich fluids in marine or volcanic environments, often during the Precambrian era.
Uses & applications
Used primarily in lapidary work, decorative carvings, cabochons, and as an ornamental gemstone.
Geological facts
Red jasper gets its distinct color from iron(III) inclusions. It has been used for talismans and seals since ancient times.
Field identification & locations
Identified by its conchoidal fracture, high hardness, and opaque, earthy red appearance. Found worldwide in riverbeds and silicate deposits.
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