mineral

Polished red jasper pebble

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

AI-generated identification · may be incorrect

Typically opaque reddish-brown with a dull to waxy luster; hardness about 6.5–7 Mohs, no visible cleavage, and conchoidal fracture. The gray-blue edge may be natural host rock, weathering rind, or surface coating, so the image alone cannot confirm composition.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal material; iron oxides produce the red color. Deposits range from Precambrian to recent, depending on locality.

Uses & applications

Used for cabochons, carvings, beads, ornamental objects, and inexpensive lapidary specimens; occasionally used as decorative aggregate.

Geological facts

A magnet may respond weakly if magnetite is present, while streak is usually white to pale brown. True jasper generally feels stone-hard and does not scratch easily with a steel knife.

Field identification & locations

Common worldwide, including India, Madagascar, Brazil, South Africa, Australia, and the western United States. Inspect for granular texture, opaque color, and consistent hardness; a hardness test and fresh edge are needed to distinguish it from dyed stone, slag, or coated material.