mineral

Tumbled jasper

Microcrystalline quartz (chalcedony), chiefly SiO₂, colored by iron oxides and other impurities

AI-generated identification · may be incorrect

Typically opaque, mottled red-brown, cream, and gray with a waxy to glassy luster; hardness about 6.5–7 Mohs, no visible cleavage, and cryptocrystalline structure. The rounded shape indicates mechanical tumbling and polishing.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or fill pores in volcanic or sedimentary rocks, with iron producing red and brown colors; deposits range from Precambrian to recent. Common sources include Madagascar, Brazil, India, Australia, and the western United States.

Uses & applications

Used for cabochons, beads, carvings, decorative objects, and inexpensive polished specimens; occasionally used as a minor ornamental stone.

Geological facts

Jasper is a variety of chalcedony rather than a single mineral species, and its patterns are determined by impurities and replacement textures.

Field identification & locations

Identify it by its opaque appearance, fine-grained texture, hardness, and resistance to scratching by a steel blade; unlike glass, it lacks bubbles and has earthy, irregular color zoning. Typical value is $3–$20 for a small tumbled piece, or $20–$100+ for unusually attractive patterned material.