mineral
Polished red jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
