sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, colors range from green, brown, red, to yellow due to iron oxide impurities, vitreous to dull luster, cryptocrystalline structure with no visible 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, colors range from green, brown, red, to yellow due to iron oxide impurities, vitreous to dull luster, cryptocrystalline structure with no visible cleavage, 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 existing rocks over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and polished display specimens.
Geological facts
Jasper has been used since ancient times for amulets, seals, and weaponry. The name means 'spotted or speckled stone' from ancient Greek.
Field identification & locations
Identified by its opaque appearance, hardness that scratches glass, and smooth waxy or vitreous polish. Found worldwide in riverbeds, ancient sedimentary deposits, and volcanic regions.
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