mineral

Polished jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide impurities

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque brown-orange and cream coloration, waxy to vitreous luster, dense fine-grained texture, and no visible cleavage. The rounded, glossy surface indicates tumbling or polishing.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediments, incorporating iron oxides that create red, orange, and brown patterns; ages vary widely by deposit. This specimen is likely a naturally formed pebble later polished by humans.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, ornamental objects, and lapidary practice; it has little industrial value compared with ordinary quartz.

Geological facts

Jasper is a variety of opaque chalcedony and can display brecciated, orbicular, landscape, or dendritic patterns. Color intensity commonly reflects hematite or limonite content.

Field identification & locations

Identify it by its opaque appearance, fine texture, hardness, and lack of cleavage; it should not scratch easily with a steel blade. Common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States.