mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, reddish-brown with a vitreous to waxy luster, opaque, and lacking visible crystal cleavage; the small specimen appears polished/tumbled.

Identified August 29, 2026More mineral →

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Physical properties

Typically Mohs hardness 6.5–7, reddish-brown with a vitreous to waxy luster, opaque, and lacking visible crystal cleavage; the small specimen appears polished/tumbled.

Formation & geological history

Forms when silica-rich groundwater replaces or cements sediments and volcanic material, with iron producing the red coloration. Deposits occur in many geological ages, commonly in volcanic and sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and lapidary practice; quality depends on color, pattern, polish, and size.

Geological facts

Jasper is a variety of chalcedony or cryptocrystalline quartz, though the term is often used broadly for opaque silica-rich rock. Red coloration is usually due to hematite or related iron oxides.

Field identification & locations

Identify by its opaque red-brown body color, strong polish, hardness, and lack of cleavage; it should resist scratching by a steel blade. Common sources include India, Brazil, Madagascar, the United States, and Australia.