mineral

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque mustard-brown, fine-grained, and matte to faintly waxy; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. The apparent crack may be a natural fracture or surface wear.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rock, with iron oxides producing the brown color. Formation ages vary widely, commonly from Precambrian to younger volcanic settings.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and decorative objects; generally not used as structural construction stone in pieces this small.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz, though trade names often include other dense siliceous rocks. Color and patterns reflect impurities such as hematite, goethite, and clay minerals.

Field identification & locations

Identify it by its opaque earthy color, very fine texture, glassy-to-waxy fracture, and inability to scratch it with a steel knife easily; a streak test should be white to pale. Common sources include India, Brazil, Madagascar, the western United States, and Australia.