sedimentary

Tumbled red-brown jasper

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

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque red-brown color, dull to waxy luster, and no visible cleavage; composed of cryptocrystalline quartz with a dense, fine-grained texture.

Identified September 17, 2026More sedimentary →

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Physical properties

Typically Mohs hardness 6.5–7, opaque red-brown color, dull to waxy luster, and no visible cleavage; composed of cryptocrystalline quartz with a dense, fine-grained texture.

Formation & geological history

Forms when silica-rich fluids replace or cement sediment, often incorporating hematite or goethite that produces the red coloration. Jasper occurs in many geological ages, commonly in volcanic-sedimentary sequences and silica-rich sedimentary beds.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and inexpensive decorative objects; this small water-worn or tumbled piece has modest commercial value.

Geological facts

The rounded shape and smooth surface indicate natural stream/beach abrasion or tumbling. Red coloration is mainly caused by finely dispersed iron oxides.

Field identification & locations

Identify it by its opaque brick-red to brown color, very fine texture, lack of cleavage, and ability to scratch glass. Common worldwide, including beach and river gravels; exact variety cannot be confirmed visually from this image.