mineral
Red jasper pebble
Microcrystalline quartz (SiO₂), colored by iron oxides
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; opaque reddish-brown, dull to slightly waxy luster, cryptocrystalline quartz, with no visible cleavage and conchoidal fracture. The rounded shape indicates natural or tumbled abrasion.
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Physical properties
Hardness about 6.5–7 Mohs; opaque reddish-brown, dull to slightly waxy luster, cryptocrystalline quartz, with no visible cleavage and conchoidal fracture. The rounded shape indicates natural or tumbled abrasion.
Formation & geological history
Forms when silica-rich fluids or sediments become cemented and iron minerals impart red coloration, commonly in sedimentary or volcanic environments. Individual pieces may range from ancient Precambrian material to much younger gravel deposits.
Uses & applications
Used for cabochons, beads, carvings, decorative objects, and small polished specimens; occasionally used as ornamental stone. It has little value as bulk construction material.
Geological facts
Jasper is a variety of opaque chalcedony/microcrystalline quartz rather than a single mineral species. Red color typically results from hematite or other iron-oxide inclusions.
Field identification & locations
Identify it by its dense opaque red-brown body, glassy edges when freshly broken, lack of cleavage, and inability to scratch it with a steel knife; quartz or glass can scratch it. Common in volcanic terrains and stream gravels worldwide.
