mineral

Polished brecciated jasper

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

AI-generated identification · may be incorrect

Opaque, polished pebble with cream, reddish-brown, pink, and dark gray patches; vitreous to waxy luster. Hardness about 6.5–7 Mohs, cryptocrystalline structure, no visible cleavage, and typical specific gravity near 2.6.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement volcanic or sedimentary fragments, with iron oxides producing red and brown colors; generally Precambrian to younger. The specimen appears tumbled or polished rather than naturally weathered.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive collector specimens; not typically used as a construction stone.

Geological facts

Jasper is an opaque variety of quartz distinguished from agate by its lack of prominent translucency. Brecciation creates the angular, patchwork color pattern.

Field identification & locations

Identify by its glassy/waxy polish, opacity, quartz-like hardness, and irregular iron-stained patterns; common sources include India, Madagascar, Brazil, Mexico, and the western United States. A definitive identification may require hardness and specific-gravity testing.