mineral

Tumbled jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Opaque, polished brown-red stone with black and tan mottling; dull to vitreous luster, no visible cleavage, conchoidal fracture, hardness about 6.5–7 Mohs, and specific gravity near 2.6.

Identified September 17, 2026More mineral →

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Physical properties

Opaque, polished brown-red stone with black and tan mottling; dull to vitreous luster, no visible cleavage, conchoidal fracture, hardness about 6.5–7 Mohs, and specific gravity near 2.6.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rocks, commonly incorporating iron oxides that create red-brown colors. Its exact geological age cannot be determined from the image; jasper occurs in many ancient and modern formations.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive lapidary specimens; it has little industrial use beyond decorative stone.

Geological facts

The specimen appears tumbled and polished, possibly a brecciated or scenic variety rather than a single uniform jasper type.

Field identification & locations

Identify jasper by its opacity, fine-grained texture, strong polish, and lack of distinct crystals; common sources include Brazil, Madagascar, India, Australia, Mexico, and the western United States. A definitive variety requires closer inspection or testing.