sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to vitreous), conchoidal fracture, variable colors including dark green, brown, red, and yellow, often featuring veins or banding.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to vitreous), conchoidal fracture, variable colors including dark green, brown, red, and yellow, often featuring veins or banding.
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal conditions, often replacing organic material or filling fractures in older rocks over millions of years.
Uses & applications
Used primarily in lapidary arts, making cabochons, beads, ornamental carvings, and jewelry.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness and ability to take a high polish.
Field identification & locations
Identified by its high hardness (scratches glass), waxy luster, lack of cleavage, and opaque earthy or colorful patterns. Found worldwide in riverbeds, mountains, and sedimentary deposits.
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