mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque reddish-brown, with a vitreous to waxy luster and no visible cleavage; this specimen is polished/tumbled and contains small reflective mineral grains.

Identified August 17, 2026More mineral →

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Physical properties

Typically hardness 6.5–7 Mohs, opaque reddish-brown, with a vitreous to waxy luster and no visible cleavage; this specimen is polished/tumbled and contains small reflective mineral grains.

Formation & geological history

Forms when silica-rich groundwater replaces or fills cavities and fractures in volcanic or sedimentary rocks, with iron producing the red color. Deposits occur in many ages, commonly in Precambrian and younger formations.

Uses & applications

Used for cabochons, beads, carvings, decorative objects, and lapidary practice; it has minor ornamental value rather than major industrial value.

Geological facts

Jasper is technically a rock composed predominantly of microcrystalline quartz, not a single-crystal mineral. Color and patterns vary widely with iron, manganese, clay, and other inclusions.

Field identification & locations

Identify it by its opaque red-brown body, very fine texture, lack of cleavage, and inability to scratch with a steel nail; quartz or glass can scratch it. Common sources include India, Madagascar, Brazil, South Africa, and the western United States.