mineral

Red jasper pebble

Microcrystalline quartz (SiO₂), colored chiefly by iron oxides

AI-generated identification · may be incorrect

Typically opaque brick-red to brown, with a dull to subtly waxy luster; hardness about 6.5–7 Mohs, no cleavage, conchoidal fracture, and specific gravity near 2.6. The rounded, smooth shape indicates natural water wear or tumbling.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine-grained sediments or volcanic material, with hematite/goethite producing the red color. Individual pieces may range from Precambrian to much younger geological ages depending on the source.

Uses & applications

Used as an ornamental and lapidary stone for cabochons, beads, carvings, polished stones, and decorative objects; rarely used as aggregate. Common specimens generally have modest value.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, though its opaque, iron-rich appearance distinguishes it from translucent agate. Patterns and color intensity can make some varieties collectible.

Field identification & locations

Identify it by its opaque red-brown color, very fine grain, lack of visible crystals, and ability to scratch glass; it should not fizz with dilute hydrochloric acid. Common sources include river gravels and volcanic or sedimentary terrains worldwide, especially India, Madagascar, Brazil, Australia, and the western United States.