sedimentary

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored primarily by iron oxides

AI-generated identification · may be incorrect

Typically opaque brick-red to brown, with a dull to waxy luster and very fine-grained texture; Mohs hardness about 6.5–7, no visible cleavage, conchoidal fracture, and specific gravity around 2.5–2.7. The rounded shape and surface sheen suggest natural water wear or tumbling.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids cement or replace sediment, volcanic ash, or other rocks, with iron oxides producing the red color; individual deposits range from Precambrian to much younger. This specimen was likely rounded in a stream or deliberately polished.

Uses & applications

Used as an ornamental stone, cabochons, beads, carvings, bookends, and lapidary material; historically used for tools and decorative objects. Common pieces have modest collector value.

Geological facts

Its red coloration is caused by hematite or related iron minerals dispersed through quartz. Jasper is a variety of chert distinguished by its opacity and abundant impurities.

Field identification & locations

Identify it by its opaque red-brown color, fine texture, hardness, and inability to scratch with a steel knife easily; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, Australia, and the western United States.