mineral

Tumbled red jasper

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, reddish-brown with dark inclusions, opaque, and dull to vitreous when polished; quartz has trigonal crystal structure but is too fine-grained to show crystals.

Identified August 25, 2026More mineral →

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Physical properties

Typically Mohs hardness 6.5–7, reddish-brown with dark inclusions, opaque, and dull to vitreous when polished; quartz has trigonal crystal structure but is too fine-grained to show crystals.

Formation & geological history

Forms when silica-rich fluids cement or replace sediment and volcanic material, with iron producing the red color; deposits range from Precambrian to much younger ages.

Uses & applications

Used for cabochons, beads, carvings, and decorative stones; also sold as an inexpensive lapidary and collecting material.

Geological facts

The specimen appears rounded and polished, indicating tumbling; natural jasper often shows brecciation, banding, or dendritic iron-oxide patterns.

Field identification & locations

Identify it by its red opaque body, fine texture, lack of cleavage, and ability to scratch ordinary glass; common sources include India, Madagascar, Brazil, the United States, and Australia.