mineral

Red jasper pebble

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

AI-generated identification · may be incorrect

Typically hardness 6.5–7, reddish-brown, opaque, and dull to waxy-lustrous; lacks visible crystals and has no distinct cleavage. The rounded form indicates natural water abrasion or tumbling.

Identified August 26, 2026More mineral →

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Physical properties

Typically hardness 6.5–7, reddish-brown, opaque, and dull to waxy-lustrous; lacks visible crystals and has no distinct cleavage. The rounded form indicates natural water abrasion or tumbling.

Formation & geological history

Forms when silica-rich fluids replace or cement fine-grained sediments, with iron oxides producing the red color; specimens range from Precambrian to recent deposits. Common in river gravels, volcanic terrains, and sedimentary formations worldwide.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; crushed jasper has limited aggregate use. Its value is primarily ornamental and depends on color, pattern, and polish.

Geological facts

Jasper is a variety of chalcedony/microcrystalline quartz, though its abundant impurities make it opaque. Red coloration commonly reflects hematite or related iron minerals.

Field identification & locations

Identify it by its opaque red-brown body, very fine texture, quartz-like hardness, and inability to scratch with a steel knife easily; a streak test is usually pale or colorless rather than red. Major sources include India, Madagascar, Brazil, Australia, and the western United States.