sedimentary
Jasper
Microcrystalline Quartz (SiO2) with impurities
Hardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to dull), conchoidal fracture, trigonal crystal system, specific gravity of 2.55 to 2.91, commonly found in red, brown, yellow, or green due to iron oxide impurities.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster (waxy to dull), conchoidal fracture, trigonal crystal system, specific gravity of 2.55 to 2.91, commonly found in red, brown, yellow, or green due to iron oxide impurities.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often originating in ancient marine deposits millions of years ago.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, lapidary art, and cherished by mineral collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry (like arrowheads). Its name comes from the ancient Greek word iaspis, meaning 'spotted stone'.
Field identification & locations
Identified by its opaque nature, lack of cleavage, waxy luster, and high hardness that scratches glass. Found worldwide, particularly in regions with historic volcanic or sedimentary activity.
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