mineral

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

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.

Identified August 26, 2026More mineral →

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Physical properties

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.