mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, opaque, with a glassy to waxy luster and no visible cleavage. The rounded, polished form indicates tumbling; specific gravity is approximately 2.5–2.7.

Identified August 16, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; reddish-brown, opaque, with a glassy to waxy luster and no visible cleavage. The rounded, polished form indicates tumbling; specific gravity is approximately 2.5–2.7.

Formation & geological history

Forms when silica-rich fluids cement or replace sediments and volcanic material, with iron producing the red color; deposits range from Precambrian to younger ages. Common sources include India, Madagascar, Brazil, and the western United States.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary practice; lesser-quality material is sold as decorative stone or aggregate.

Geological facts

Jasper is a rock rather than a single pure mineral, consisting mainly of cryptocrystalline quartz with impurities. Its patterns and colors reflect iron, manganese, clay, and included minerals.

Field identification & locations

Identify it by its opaque red-brown color, very fine texture, lack of cleavage, and ability to scratch glass; it should not fizz in dilute acid. Common specimens usually have modest collector value.