mineral

Tumbled jasper (likely brecciated or red jasper)

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

AI-generated identification · may be incorrect

Opaque reddish-brown and gray, with a polished/worn surface and pale vein-like markings; typically Mohs 6.5–7, dull to slightly vitreous luster, cryptocrystalline quartz, and no visible cleavage.

Identified August 16, 2026More mineral →

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Physical properties

Opaque reddish-brown and gray, with a polished/worn surface and pale vein-like markings; typically Mohs 6.5–7, dull to slightly vitreous luster, cryptocrystalline quartz, and no visible cleavage.

Formation & geological history

Forms when silica-rich groundwater cements fine sediments or fills fractures, with iron oxides producing the red color; specimens may range from Precambrian to much younger deposits. Common in volcanic and sedimentary environments worldwide.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; generally a low-cost lapidary material.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz distinguished by its opacity from abundant impurities. The pale lines may indicate brecciation, quartz veining, or surface abrasion.

Field identification & locations

Identify it by its opaque red coloration, hardness, lack of cleavage, and inability to scratch with a steel knife easily; a streak test is usually white to pale brown. Common sources include India, Madagascar, Brazil, Australia, and the western United States.