mineral

Polished brecciated jasper pebble

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque cream, tan, black, and reddish-brown material with a polished/worn surface and waxy to dull luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and cryptocrystalline structure. The dark patches are likely manganese or iron oxides, though exact identification requires testing.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine sediments or volcanic material, commonly producing brecciation and iron-oxide coloration. It may range from Precambrian to much younger ages, depending on its deposit.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, and lapidary specimens; small polished pebbles generally have modest value.

Geological facts

Jasper is a variety of chalcedony/microcrystalline quartz rather than a single mineral species. Its mottled patterns are natural and often enhanced by polishing.

Field identification & locations

Field clues include opacity, fine grain, glassy-to-waxy fracture, and resistance to scratching; it should not be scratched with a steel knife easily. Common sources include India, Madagascar, Brazil, Australia, and the western United States.