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 hardness 6.5–7, opaque, red-brown with darker iron-rich bands, and a dull to vitreous waxy luster. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.5–2.9.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediments and volcanic material, with hematite/goethite producing the red coloration; deposits range from Precambrian to younger ages. The rounded shape indicates natural water abrasion or tumbling.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and ornamental objects; historically used for tools and seals. It is generally a decorative lapidary material rather than a construction stone.

Geological facts

Its banded appearance may overlap with brecciated jasper, red chert, or iron-rich agate. A glassy scratch test should be avoided on valuable specimens, but jasper commonly scratches ordinary glass.

Field identification & locations

Common in volcanic and sedimentary terrains worldwide, including India, Brazil, Madagascar, Australia, and the western United States. Identify it by its opaque red color, fine grain, lack of cleavage, and resistance to scratching.