sedimentary

Jasper (likely red/brown jasper pebble)

Microcrystalline quartz (SiO₂), an opaque variety of chalcedony; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Red-brown, opaque, with a dull to waxy luster and mottled pattern. Quartz hardness is about 6.5–7 Mohs; microcrystalline, with no visible cleavage and conchoidal fracture.

Identified September 29, 2026More sedimentary →

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Physical properties

Red-brown, opaque, with a dull to waxy luster and mottled pattern. Quartz hardness is about 6.5–7 Mohs; microcrystalline, with no visible cleavage and conchoidal fracture.

Formation & geological history

Silica-rich fluids or sediments formed the fine-grained quartz, with iron oxides supplying the red-brown color. Jasper occurs in ancient sedimentary and volcanic settings; the specimen’s age and precise origin cannot be determined visually.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; less commonly, silica-rich material is used as a source of silica.

Geological facts

Jasper is a trade name for opaque, patterned chalcedony rather than a single distinct mineral species.

Field identification & locations

Look for opacity, earthy red/brown coloration, and a very fine-grained texture; it should scratch glass if genuinely quartz-rich. Common in many regions worldwide, but appearance alone cannot rule out other iron-stained rocks.