mineral

Tumbled brown jasper pebble

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque brown, earthy surface with thin pale quartz or chalcedony veins; dull to slightly waxy luster, cryptocrystalline structure, no visible cleavage, and hardness about 6.5–7 Mohs. The black object beneath appears to be a separate ring or holder, not part of the specimen.

Identified August 11, 2026More mineral →

Explore Tumbled brown jasper pebble 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 fine sediment, often with iron staining; its age varies widely by deposit, from Precambrian to younger volcanic or sedimentary settings.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive lapidary specimens; occasionally used decoratively in stonework.

Geological facts

The term “jasper” describes an opaque, fine-grained quartz-rich rock rather than one single mineral species. Pale vein networks may consist of quartz, chalcedony, or healed fractures.

Field identification & locations

Identify it by its opaque brown color, fine grain, silica-like hardness, and inability to scratch with a steel knife easily; common sources include India, Madagascar, Brazil, Australia, and the western United States.