sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically brown, red, yellow, or orange due to iron oxide impurities, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, and specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically brown, red, yellow, or orange due to iron oxide impurities, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture, and specific gravity around 2.58 to 2.91.
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often replacing existing carbonate rocks, dating from various geological eras.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, decorative objects, and as a collector's specimen.
Geological facts
Jasper has been used since antiquity for seals, signet rings, and weaponry; polished varieties often showcase fascinating natural banding and patterns.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy luster, opaque nature, and characteristic earthy or reddish-brown coloration. Found worldwide, particularly in regions with ancient volcanic activity or hydrothermal deposits.
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