mineral
Polished red jasper (likely brecciated or orbicular jasper)
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
AI-generated identification · may be incorrectMohs hardness 6.5–7; opaque, brick-red and gray-white, with a waxy to glassy polish and no visible cleavage. It is cryptocrystalline quartz, commonly colored by hematite or goethite.
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Physical properties
Mohs hardness 6.5–7; opaque, brick-red and gray-white, with a waxy to glassy polish and no visible cleavage. It is cryptocrystalline quartz, commonly colored by hematite or goethite.
Formation & geological history
Forms when silica-rich fluids cement fine sediment or volcanic ash, with iron oxides producing the red coloration; deposits range from Precambrian to younger ages. The specimen is tumbled and polished.
Uses & applications
Used for cabochons, beads, carvings, ornaments, and inexpensive collector specimens; occasionally used as decorative stone.
Geological facts
Jasper is a variety of chalcedony distinguished by its opacity and abundant impurities. Red coloration commonly reflects finely disseminated hematite.
Field identification & locations
Identify by its opaque red body, gray or cream patterning, hardness, and inability to scratch glass easily; common sources include India, Madagascar, Brazil, Australia, and the western United States.
