mineral

Tumbled brown jasper

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper

AI-generated identification · may be incorrect

Opaque, reddish-brown to ochre with a waxy-to-dull polish and no visible cleavage; quartz hardness is 7 Mohs, trigonal crystal structure, and specific gravity about 2.6. The photograph alone cannot confirm the exact variety.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace sediment, commonly incorporating iron oxides that create earthy colors. It occurs in many geological ages and settings; this specimen has been mechanically tumbled and polished.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive collectible specimens.

Geological facts

Jasper is an opaque variety of chalcedony, itself a microcrystalline form of quartz; its patterns and colors arise from mineral impurities.

Field identification & locations

Look for opacity, hardness, and a fine-grained surface; quartz will scratch glass, though that test can damage a polished piece. Jasper is found worldwide, including India, Brazil, Australia, and the western United States.