sedimentary

Polished brown jasper pebble

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, tan, and cream patterning, with a smooth polished surface and dull to vitreous luster. Quartz is cryptocrystalline and has no visible cleavage; specific gravity is about 2.6.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine sediment, often incorporating iron oxides that create red-brown coloration. Individual pieces may range from ancient Precambrian material to younger volcanic or sedimentary deposits.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; common material has modest collector value.

Geological facts

The irregular cream-and-brown pattern is typical of brecciated, scenic, or picture jasper varieties, though exact locality cannot be determined from the image alone.

Field identification & locations

Identify it by its opaque body, fine-grained texture, earthy iron staining, and resistance to scratching by a steel knife; it should not fizz in dilute acid. Common sources include the western United States, Madagascar, Australia, Brazil, and India.