metamorphic
Polished red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by hematite/goethite
AI-generated identification · may be incorrectTypically Mohs 6.5–7, opaque reddish-brown, dull to waxy or glassy luster, cryptocrystalline quartz with no visible cleavage; specific gravity about 2.6. The rounded, polished surface indicates a tumbled or water-worn specimen.
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Physical properties
Typically Mohs 6.5–7, opaque reddish-brown, dull to waxy or glassy luster, cryptocrystalline quartz with no visible cleavage; specific gravity about 2.6. The rounded, polished surface indicates a tumbled or water-worn specimen.
Formation & geological history
Forms when silica-rich fluids replace or cement sediments, with iron oxides producing the red-brown color; deposits range from Precambrian to recent. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.
Uses & applications
Used for cabochons, beads, carvings, ornamental objects, and lapidary tumbling; occasionally used as decorative stone rather than structural construction material.
Geological facts
Jasper is an opaque variety of chalcedony/microcrystalline quartz, and its patterns and colors result from impurities and mineral inclusions. This specimen may also be sold as red or brown jasper.
Field identification & locations
Identify it by its opaque iron-red color, fine texture, lack of cleavage, and ability to scratch ordinary glass; a steel file generally does not scratch it. Exact identification would benefit from a hardness, streak, or specific-gravity test.
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