mineral

Tumbled brecciated jasper

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

AI-generated identification · may be incorrect

Polished reddish-brown stone with cream-colored patches; waxy to vitreous luster. Quartz hardness 6.5–7, trigonal crystal structure, no cleavage; specific gravity about 2.6. Exact variety cannot be confirmed from appearance alone.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, with iron oxides providing red-brown color; brecciation produces contrasting angular patches. It may form in many geological settings and ages; tumbling is human processing.

Uses & applications

Commonly used for beads, cabochons, small carvings, and inexpensive collectible stones.

Geological facts

Jasper is an opaque variety of chalcedony, itself a microcrystalline form of quartz.

Field identification & locations

Look for opaque, patterned color and a hard, glass-scratching surface; jasper occurs worldwide. The photo shows a small polished/tumbled piece, so its source locality is not identifiable.