mineral
Red jasper pebble
Jasper, opaque microcrystalline quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectTypically hardness 6.5–7 Mohs, reddish-brown, opaque, and dull to subtly waxy; it has a cryptocrystalline quartz structure, no visible cleavage, and conchoidal fracture. The rounded shape indicates natural water wear or tumbling.
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Physical properties
Typically hardness 6.5–7 Mohs, reddish-brown, opaque, and dull to subtly waxy; it has a cryptocrystalline quartz structure, no visible cleavage, and conchoidal fracture. The rounded shape indicates natural water wear or tumbling.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement sediment, commonly incorporating hematite or goethite; many deposits formed in Precambrian volcanic and sedimentary environments. This specimen is likely a naturally weathered or polished pebble.
Uses & applications
Used as an ornamental stone, cabochon, bead, carving material, and decorative aggregate; it has modest jewelry and lapidary appeal.
Geological facts
Red coloration comes from finely dispersed iron oxides, while dark bands or seams may reflect manganese oxides, fractures, or other impurities. Jasper is a variety of chalcedony/microcrystalline quartz rather than a single mineral species.
Field identification & locations
Identify it by its opaque brick-red color, fine texture, lack of cleavage, and resistance to scratching; quartz should not scratch it, while a steel file may have difficulty. Common in volcanic terrains, river gravels, and silica-rich sedimentary formations.
