mineral

Red jasper

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

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque brick-red to reddish brown, with a dull to glassy/waxy luster and no visible cleavage; conchoidal to uneven fracture. The specimen appears as a thin, naturally broken or cut fragment with iron-rich staining.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, incorporating hematite or other iron oxides; deposits range from Precambrian to recent. Common worldwide, including India, Brazil, Madagascar, Australia, and the United States.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and decorative stone; larger uniform pieces may be used as tile or architectural accents. Small rough fragments generally have modest value.

Geological facts

Jasper is technically a rock rather than a single mineral, because it commonly contains quartz plus hematite, clay, and other impurities. Its red color is a useful indicator of oxidized iron.

Field identification & locations

Identify by its opaque red color, very fine grain, hardness, and resistance to scratching by steel; it should not fizz in dilute acid. Common rough pieces are worth about $1–$10; attractive polished or patterned specimens typically sell for $10–$50.