mineral

Polished orbicular jasper

Microcrystalline quartz (SiO₂) with iron-rich and altered volcanic inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; gray-green to brown with rounded orbicular markings, waxy to vitreous luster, opaque, and no visible cleavage. The smooth shape is tumbled or polished, not natural crystal form.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic sediments and cavities; orbicular patterns develop from concentric mineral growth or altered inclusions. Specimen age depends on its source, commonly Paleozoic to Mesozoic volcanic terrains.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and decorative objects; it has modest jewelry and collector appeal.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, and its patterns are caused by mineral impurities rather than quartz crystal faces.

Field identification & locations

Identify by its opaque body, fine grain, high polish, and distinctive rounded inclusions; test cautiously with a steel file, since quartz-rich jasper resists scratching. Similar material occurs in Madagascar, Mexico, Oregon, Indonesia, and Australia.