mineral

Red jasper

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

AI-generated identification · may be incorrect

Opaque brick-red to salmon with gray-black mineral streaks, matte to dull waxy luster, and irregular fracture; quartz hardness is about 6.5–7 Mohs, with no cleavage. The specimen appears naturally weathered or lightly worn rather than crystalline.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rock, with iron oxides producing the red color. It can form in many geological ages, commonly in volcanic and sedimentary environments.

Uses & applications

Used as ornamental stone, cabochons, carvings, beads, bookends, and tumblestones; occasionally used for decorative flooring or countertops.

Geological facts

Its red color reflects hematite or related iron-oxide inclusions. Jasper is a variety of chalcedony/microcrystalline quartz, though the name is also used broadly for opaque silica-rich rocks.

Field identification & locations

Identify it by its opaque red body, fine-grained texture, high hardness, and lack of visible large crystals; it should resist scratching from a steel knife. Common sources include India, Madagascar, Brazil, the United States, and Australia.