mineral

Tumbled brown jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque tan-brown stone with reddish iron staining, waxy-to-glassy luster, and rounded polish; hardness about 6.5–7 Mohs, no cleavage, conchoidal fracture, and specific gravity near 2.6.

Identified August 11, 2026More mineral →

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Physical properties

Opaque tan-brown stone with reddish iron staining, waxy-to-glassy luster, and rounded polish; hardness about 6.5–7 Mohs, no cleavage, conchoidal fracture, and specific gravity near 2.6.

Formation & geological history

Forms when silica-rich groundwater fills or replaces sedimentary or volcanic cavities, with iron oxides producing the brown coloration; individual pieces may range from relatively young to Precambrian in age.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, lapidary inlay, and decorative objects; common polished pieces generally have modest value.

Geological facts

Jasper is a variety of opaque chalcedony and may show brecciated, orbicular, scenic, or dendritic patterns. The smooth shape and high gloss indicate mechanical tumbling and polishing.

Field identification & locations

Identify it by its opacity, fine-grained texture, brown-red coloration, lack of visible crystals, and resistance to scratching by a steel blade; common sources include India, Madagascar, Brazil, Mexico, and the United States.