mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Typically reddish-brown, opaque, and waxy to dull with no visible crystals; Mohs hardness 6.5–7, massive cryptocrystalline structure, conchoidal fracture, and specific gravity about 2.5–2.9. The smooth rounded surface indicates tumbling or natural water wear.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron producing the red color; deposits range from Precambrian to younger rocks. Common sources include India, Brazil, Madagascar, Australia, and the western United States.

Uses & applications

Used for cabochons, beads, carvings, tumblestones, ornaments, and lapidary work; occasionally used as decorative stone. Common pieces have modest collector value.

Geological facts

Jasper is a rock rather than a single mineral, usually consisting predominantly of quartz with chalcedony and iron-oxide inclusions. The specimen may also be a red chert or iron-rich quartzite if its texture is more granular.

Field identification & locations

Identify by its opaque brick-red color, very fine texture, hardness, and resistance to scratching by a steel blade; it should not fizz in dilute hydrochloric acid. Look for natural brecciation, banding, or dendritic patterns typical of jasper varieties.