sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, massive or microgranular crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, massive or microgranular crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or associated with volcanic activity, often replacing organic material or filling cavities over millions of years.
Uses & applications
Used widely for ornamental carvings, polished stones, cabochons in jewelry, and as a decorative stone in architecture.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry, with ancient civilizations valuing it for its strength and protective qualities.
Field identification & locations
Can be identified in the field by its waxy luster, opaque nature, hardness that scratches glass, and smooth rounded pebble appearance in riverbeds.
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