mineral

Tumbled dark reddish-brown stone, possibly red jasper

Jasper, microcrystalline quartz (SiO₂), likely iron-oxide colored

AI-generated identification · may be incorrect

Opaque, reddish-brown, smooth and rounded from tumbling, with a dull to mildly waxy luster. Hardness about 6.5–7 Mohs; no visible cleavage; typically cryptocrystalline quartz with specific gravity near 2.6.

Identified September 7, 2026More mineral →

Explore Tumbled dark reddish-brown stone, possibly red jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material, with iron oxides producing the red-brown color. Formation ages vary widely, commonly Precambrian to younger; the specimen has been human-polished.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; common pieces have modest collector value.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz. Its patterns and colors reflect impurities such as hematite, goethite, clay, or manganese minerals.

Field identification & locations

Identify it by its opaque body, earthy red-brown color, smooth polish, and inability to scratch with a copper coin; it should scratch ordinary glass. Common sources include India, Madagascar, Brazil, Australia, and the western United States.