sedimentary
Jasper
Silicon dioxide (SiO2) - Microcrystalline quartz variety
Hardness of 6.5 to 7 on the Mohs scale, varies in color including red, brown, yellow, and green, dull to greasy luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, varies in color including red, brown, yellow, and green, dull to greasy luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91
Formation & geological history
Formed through the silica-rich precipitation in marine environments or hydrothermal solutions, often replacing organic material or filling fractures in older rocks over millions of years
Uses & applications
Used for ornamental carvings, polished stones, jewelry, and lapidary art
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and intricate carvings due to its durability and rich coloration
Field identification & locations
Found worldwide in sedimentary and volcanic deposits; identified by its opaque nature and smooth, conchoidal fracture
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