mineral

Red jasper (tumbled)

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

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque brick-red to reddish-brown, with a smooth vitreous-to-waxy luster; lacks visible crystal faces and has conchoidal fracture. The dark vein may be a natural fracture filled with manganese/iron oxides or contrasting silica.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace volcanic ash, sediments, or other rocks; iron impurities produce the red color. Deposits formed across many geologic ages, commonly in volcanic and hydrothermal environments.

Uses & applications

Used as ornamental stone, beads, cabochons, carvings, and inexpensive lapidary material; occasionally used for decorative tiles and small objects.

Geological facts

Jasper is a variety of chalcedony-rich quartz rather than a single mineral species. Red coloration generally indicates hematite or related iron-oxide inclusions.

Field identification & locations

Identify by its opaque red color, dense feel, fine texture, 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.