mineral

Polished red jasper (likely brecciated or orbicular jasper)

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-purple tumbled stone with darker blue-gray markings and a waxy to dull polish; Mohs hardness about 6.5–7, no visible cleavage, cryptocrystalline structure, specific gravity ~2.5–2.7.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater cements or replaces volcanic ash, sediments, or breccia; iron minerals create the red coloration. Formation ages vary widely, commonly from Precambrian to younger volcanic and sedimentary settings.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; generally inexpensive as a polished tumble.

Geological facts

Jasper is a variety of chert distinguished by its opacity and abundant impurities. Blue-gray veining or fragments may indicate brecciation or other included minerals rather than a single pure jasper variety.

Field identification & locations

Identify it by its opaque body, red iron-stained color, very fine texture, and ability to scratch glass while resisting a steel blade. Common sources include India, Madagascar, Brazil, the United States, and Australia; exact identification may require a cut surface or testing.