mineral

Polished red jasper

Jasper, a microcrystalline variety of quartz (mostly SiO₂)

AI-generated identification · may be incorrect

Typically 6.5–7 Mohs; opaque brick-red to orange-red with dark gray/black iron-oxide or matrix bands, waxy to vitreous luster, cryptocrystalline structure, and no visible cleavage. The smooth surface indicates a tumbled or cabochon-polished specimen.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rock, with iron oxides producing the red color; deposits range from Precambrian to younger ages. Common sources include India, Madagascar, Brazil, Mexico, Australia, and the United States.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive gemstone jewelry; harder varieties are also used as decorative stone.

Geological facts

Jasper is technically a rock rather than a single mineral, composed mainly of interlocking microscopic quartz crystals. Red coloration generally reflects hematite or related iron oxides.

Field identification & locations

Identify it by its opaque red body, contrasting natural bands, glassy/waxy polish, and inability to scratch with a steel knife; quartz or glass should scratch it. It is commonly sold as red jasper, brecciated jasper, or mookaite depending on pattern and locality.