mineral

Tumbled brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely brecciated and iron-oxide stained

AI-generated identification · may be incorrect

Opaque dark reddish-brown stone with black pits and a cream-white angular quartz/chalcedony fragment; dull to slightly waxy luster, conchoidal fracture, Mohs hardness about 6.5–7, and specific gravity near 2.6. The rounded shape indicates natural water wear or tumbling.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal material, with iron oxides producing red-brown colors; brecciation records fracturing and later mineral filling. Precise age and locality cannot be determined from the photograph.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and lapidary specimens; it has little industrial value compared with ordinary quartz.

Geological facts

The contrasting cream patch is probably quartz or light chalcedony, while the dark cavities may be weathering voids or iron-rich inclusions.

Field identification & locations

Identify by its opacity, red-brown iron staining, hardness, and fine-grained texture; common sources include Oregon, Idaho, Utah, India, Madagascar, and Australia. A scratch test with quartz can help confirm hardness, though it may damage the specimen.