mineral

Tumbled brown banded jasper

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, gold, and reddish bands with a smooth, waxy to dull luster. Massive, cryptocrystalline structure with no visible cleavage; specific gravity approximately 2.5–2.7.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, while iron oxides create the brown and red banding. Individual deposits range from Paleozoic to Cenozoic in age.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary specimens; occasionally marketed as picture jasper or scenic jasper. Common tumbled pieces have modest commercial value.

Geological facts

The specimen appears polished or tumbled, so its rounded shape and glossy surface are human-processed rather than natural weathering features.

Field identification & locations

Identify by its opaque, fine-grained texture, curved or irregular iron-colored banding, lack of large crystals, and inability to scratch it easily with a steel knife. Common sources include Brazil, India, Madagascar, Australia, Mexico, and the western United States.