mineral

Tumbled orange-brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Opaque, orange-brown with dark gray matrix and a polished surface; Mohs hardness about 6.5–7, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The elongated form appears naturally rounded and tumbled or water-worn.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or fractured rock, with iron oxides producing the orange coloration. It occurs in many ages and settings, commonly in volcanic and sedimentary terrains.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; lower-grade material is inexpensive ornamental stone rather than a construction aggregate.

Geological facts

Jasper is a variety of opaque chalcedony and can show brecciation, veins, or dendritic patterns. Orange hues commonly reflect hematite or goethite inclusions.

Field identification & locations

Identify it by its opacity, orange iron-stained color, fine-grained texture, and ability to scratch glass; it will not fizz in dilute acid. Common sources include Oregon, Idaho, California, India, Madagascar, and Brazil.