sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster, multicolored often featuring brown, beige, and dark patches due to mineral impurities, trigonal crystal system with a microcrystalline structure.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, multicolored often featuring brown, beige, and dark patches due to mineral impurities, trigonal crystal system with a microcrystalline structure.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often originating in ancient ocean basins over millions of years.
Uses & applications
Used primarily in lapidary arts, making cabochons, beads, decorative carvings, and as a collector's tumbled stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its name means 'spotted or speckled stone.'
Field identification & locations
Identified by its opaque nature, hardness that scratches glass, and waxy luster when polished. Found worldwide including India, Madagascar, and the USA.
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