mineral

Red jasper pebble (probable)

Jasper, opaque microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Smooth, rounded, reddish-brown, opaque, and dull to slightly waxy; likely hardness 6.5–7 Mohs, no visible cleavage, conchoidal fracture, and specific gravity about 2.6. The surface appears tumbled or naturally water-worn.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material, with iron oxides producing the red color; its exact geological age and locality cannot be determined from the photograph. Commonly found in ancient volcanic terrains, sedimentary iron-rich beds, and river gravels.

Uses & applications

Used for cabochons, beads, carvings, tumbling, ornaments, and decorative stone; occasionally as a minor aggregate or facing material.

Geological facts

Red jasper is a variety of chert rather than a separate mineral species. Color intensity commonly reflects hematite or related iron-oxide inclusions.

Field identification & locations

Check for uniform opacity, red streaking, waxy luster, and hardness sufficient to scratch ordinary glass; it should not fizz in dilute acid. Common sources include India, Brazil, Madagascar, Australia, and the western United States.