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 6.5–7; opaque reddish-brown, waxy to vitreous luster, very fine-grained cryptocrystalline structure, and no visible cleavage. The pictured piece is polished and rounded by tumbling.

Identified September 21, 2026More mineral →

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Physical properties

Typically Mohs 6.5–7; opaque reddish-brown, waxy to vitreous luster, very fine-grained cryptocrystalline structure, and no visible cleavage. The pictured piece is polished and rounded by tumbling.

Formation & geological history

Forms when silica-rich groundwater replaces or fills cavities and sediments, incorporating iron oxides; deposits range from Precambrian to younger ages. Common sources include India, Madagascar, Brazil, Uruguay, and the western United States.

Uses & applications

Used for beads, cabochons, carvings, worry stones, ornamental objects, and lapidary work; occasionally used as decorative aggregate.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, though its opaque, impure composition distinguishes it from translucent agate. Red coloration usually reflects hematite or other iron minerals.

Field identification & locations

Identify it by its uniform opaque red-brown color, very fine texture, lack of cleavage, and ability to scratch glass; a steel blade generally does not scratch it. Exact identification is uncertain from an image alone.