mineral

Tumbled red-brown jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque reddish-brown, weakly mottled, earthy to dull vitreous luster, and rounded from tumbling; hardness about 6.5–7 Mohs, no cleavage, cryptocrystalline structure, and specific gravity near 2.5–2.7.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rocks, with hematite or goethite producing the red-brown color. Its exact geologic age cannot be determined from the image and may range from Precambrian to recent deposits.

Uses & applications

Used as a lapidary material for cabochons, carvings, beads, ornaments, and polished stones; it has modest value unless unusually patterned or from a notable locality.

Geological facts

Jasper is a variety of chert distinguished chiefly by its opacity and abundant mineral impurities. Red coloration commonly reflects finely disseminated hematite.

Field identification & locations

Identify it by its opaque red-brown body, very fine texture, lack of visible crystals, and resistance to scratching; a steel file should not readily scratch it. Common sources include India, Madagascar, Brazil, Australia, and the western United States.