mineral

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), commonly iron-stained

AI-generated identification · may be incorrect

Opaque reddish-brown to ochre, fine-grained, waxy-to-dull luster, and polished/tumbled surface with dark vein-like fractures. Mohs hardness about 6.5–7; no visible cleavage; specific gravity approximately 2.5–2.7. Exact variety cannot be confirmed from the image alone.

Identified September 19, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine sediment or volcanic material, with iron oxides producing the brown-red color. It may range from Precambrian to geologically recent; this specimen was shaped by natural abrasion and/or tumbling.

Uses & applications

Used for beads, cabochons, carvings, decorative stone, and inexpensive collectible specimens; occasionally used as crushed ornamental aggregate.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, unlike transparent gemstone-grade quartz. Veining may reflect healed fractures, brecciation, or contrasting mineral impurities.

Field identification & locations

Identify by its opacity, very fine texture, quartz-like hardness, and resistance to scratching by steel; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States.