sedimentary

Red jasper pebble

Microcrystalline quartz (SiO₂), colored chiefly by hematite/goethite

AI-generated identification · may be incorrect

Typically opaque brick-red to orange-brown, earthy to dull luster, cryptocrystalline structure, no visible cleavage, and hardness about 6.5–7 Mohs; specific gravity approximately 2.5–2.7. The specimen appears water-worn and may contain darker iron-oxide patches or brecciation.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine sediments, volcanic ash, or other rock, with iron oxides producing the red color; many examples are Precambrian to younger. This rounded piece was likely transported and smoothed in a stream, beach, or glacial deposit.

Uses & applications

Used as an ornamental and lapidary stone for cabochons, beads, carvings, polished stones, and occasionally countertops or decorative aggregate. It has limited industrial value compared with ordinary quartz.

Geological facts

The red coloration reflects finely disseminated iron oxides rather than a single large crystal. A white streak, conchoidal fracture, and resistance to scratching by ordinary steel help distinguish jasper from softer red sedimentary rocks.

Field identification & locations

Common in iron-rich sedimentary and volcanic terrains worldwide, including the United States, Australia, Brazil, India, and Madagascar. Confirm with a hardness test and lack of acid reaction; visual identification alone cannot exclude red chert or iron-rich volcanic rock.