mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Typically deep brick-red to reddish-brown with mottling; vitreous to waxy luster and no visible crystals. Mohs hardness 6.5–7, massive cryptocrystalline structure, conchoidal fracture, and specific gravity about 2.5–2.7.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements sediments and volcanic materials, with iron oxides producing the red color. Deposits occur in many ages, commonly in hydrothermal and volcanic environments.

Uses & applications

Used for beads, cabochons, carvings, tumbled stones, ornamental objects, and lapidary practice; generally not used as a major construction stone.

Geological facts

Jasper is technically a rock rather than a single mineral, commonly composed of quartz, chalcedony, and iron-bearing impurities. Red coloration is a useful indicator of hematite or related iron oxides.

Field identification & locations

Identify by its opaque red-brown color, fine texture, lack of cleavage, and inability to scratch it with a steel knife easily; a glassy surface and rounded shape indicate tumbling. Common sources include India, Madagascar, Brazil, Australia, and the western United States.