mineral

Tumbled brown jasper (likely)

Microcrystalline quartz, SiO₂; likely iron-oxide-stained jasper

AI-generated identification · may be incorrect

Opaque, mottled tan-to-brown, with a smooth polished surface and no visible cleavage. Quartz hardness is 7 Mohs; crystal structure is trigonal, though crystals are microscopic in jasper. Specific gravity is about 2.6.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, with iron oxides producing the color; it occurs in many geological ages and settings. The pictured piece has been shaped and polished, so its original formation cannot be determined from the image.

Uses & applications

Used for beads, cabochons, ornaments, and lapidary collections; jasper is not generally an important construction material.

Geological facts

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

Field identification & locations

The opaque, earthy color and polished finish fit jasper, but the image alone cannot confirm the material; hardness testing or close inspection may help distinguish it from other brown stones. Jasper occurs worldwide, including India, Brazil, Australia, and the United States.