mineral

Red jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; reddish-brown, opaque, and waxy to dull with a fine-grained texture. It has no visible cleavage, conchoidal fracture, and specific gravity around 2.5–2.7.

Identified August 20, 2026More mineral →

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Physical properties

Typically Mohs 6.5–7; reddish-brown, opaque, and waxy to dull with a fine-grained texture. It has no visible cleavage, conchoidal fracture, and specific gravity around 2.5–2.7.

Formation & geological history

Forms when silica-rich groundwater cements or replaces sediments and volcanic material, with iron producing the red coloration. Individual pieces may range from relatively young sedimentary deposits to ancient Precambrian jasper-bearing formations.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and ornamental objects; occasionally used as a minor decorative aggregate. This rounded specimen appears suitable mainly for collecting or lapidary work.

Geological facts

Jasper is a chalcedony/quartz-group material rather than a distinct mineral species. The mottled red-and-gray pattern commonly reflects iron-oxide staining and included host material.

Field identification & locations

Identify it by its opaque red color, very fine texture, glassy edges when freshly broken, and inability to scratch it with a steel knife; quartz or feldspar may scratch glass. Common sources include India, Madagascar, Brazil, the western United States, and Australia.