mineral

Tumbled jasper pebble

Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-brown, fine-grained, and smoothly rounded with a dull to waxy luster; hardness about 6.5–7 Mohs, no visible cleavage, and conchoidal fracture. The image cannot confirm exact variety or composition.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediments, often incorporating iron oxides; deposits range from Precambrian to younger volcanic and sedimentary settings. This specimen appears mechanically tumbled and polished.

Uses & applications

Used for lapidary cabochons, beads, carvings, ornamental objects, and inexpensive jewelry; not generally important as a construction stone in this small form.

Geological facts

Jasper is an aggregate rather than a single visually distinct crystal, and its red color typically reflects hematite or related iron minerals.

Field identification & locations

Identify by its opacity, earthy red-brown color, smooth polish, and quartz-like hardness; common sources include India, Madagascar, Brazil, Australia, and the western United States. A steel file should not easily scratch it, though testing may damage the surface.