mineral

Red jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque brick-red to orange, with darker and pale fragments or vein-like patches; typically dull to waxy luster and no visible cleavage. Mohs hardness is about 6.5–7; specific gravity approximately 2.5–2.7. The sharp faces suggest a cut or fractured specimen, possibly polished or coated.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement iron-stained silica, volcanic ash, or rock fragments; brecciated varieties develop from fractured material later cemented by chalcedony. Most jasper is geologically young relative to basement rocks, occurring in many Paleozoic–Cenozoic volcanic and sedimentary settings.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary specimens; occasionally as decorative stone. Common pieces generally have modest value.

Geological facts

Its red color is caused by hematite or other iron oxides. Jasper is a variety of chalcedony and lacks the large crystals typical of quartz.

Field identification & locations

Look for opaque red color, very fine texture, conchoidal fracture, and hardness sufficient to scratch glass; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, the United States, and Australia.