sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to dull), conchoidal fracture, various colors including red, brown, yellow, and green due to iron oxide impurities, 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 (waxy to dull), conchoidal fracture, various colors including red, brown, yellow, and green due to iron oxide impurities, specific gravity of 2.58 to 2.91.
Formation & geological history
Forms from the silica-rich precipitation in marine environments or hydrothermal solutions, often replacing organic material or filling cracks in sedimentary and volcanic rocks over millions of years.
Uses & applications
Used widely in ornamental carvings, cabochons for jewelry, spheres, and as a decorative stone in interior design.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, highly valued by ancient civilizations including the Egyptians, Greeks, and Minoans.
Field identification & locations
Can be identified by its opaque nature, hardness that scratches glass, waxy luster, and lack of cleavage. Found worldwide in riverbeds, mountainous regions, and sedimentary deposits.
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