mineral

Red jasper (likely polished/tumbled)

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque red to reddish-brown, with a glassy to waxy luster and no visible crystals; conchoidal fracture, negligible cleavage, and specific gravity about 2.6.

Identified August 27, 2026More mineral →

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Physical properties

Typically Mohs 6.5–7, opaque red to reddish-brown, with a glassy to waxy luster and no visible crystals; conchoidal fracture, negligible cleavage, and specific gravity about 2.6.

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron oxidation producing the red color; deposits range from Precambrian to recent.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and small polished specimens; historically used for tools and decorative stone.

Geological facts

The image shows a small, highly polished red pebble with a dark gray inclusion or surface patch, consistent with iron-rich jasper but not diagnostic from appearance alone.

Field identification & locations

Common in volcanic terrains, sedimentary iron-rich beds, and alluvial gravels worldwide, including India, Madagascar, Brazil, Australia, and the western United States. It feels dense, does not fizz in dilute acid, and should scratch glass if sufficiently fresh.