mineral

Red jasper pebble

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

AI-generated identification · may be incorrect

Opaque reddish-brown, fine-grained, waxy to dull luster, conchoidal-to-uneven fracture, no visible cleavage; Mohs hardness about 6.5–7 and specific gravity 2.5–2.7. The smooth surface indicates natural water-worn or tumbled material.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids or sediments become cemented and recrystallized, with iron oxides producing the red color; commonly Precambrian to younger. Found in volcanic and sedimentary terrains, especially river gravels and iron-rich formations.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and ornamental objects; occasionally as a minor aggregate or decorative stone.

Geological facts

Jasper is a variety of chalcedony/microcrystalline quartz, though its opaque, impure composition distinguishes it from translucent agate. Patterns and color vary with hematite and other iron minerals.

Field identification & locations

Identify by its opaque red-brown color, very fine texture, strong durability, and inability to scratch with a steel knife; quartz or glass should scratch it. Common sources include India, Madagascar, Brazil, Australia, and the western United States.