metamorphic

Polished red jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Opaque brick-red to burgundy, fine-grained, waxy to vitreous luster, massive with no visible crystals or cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.9. The rounded shape indicates a polished or tumbled specimen.

Identified September 20, 2026More metamorphic →

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Physical properties

Formation & geological history

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

Uses & applications

Used for cabochons, carvings, beads, worry stones, ornaments, and small decorative objects; occasionally used as aggregate or facing stone.

Geological facts

Jasper is technically a variety of chalcedony or microcrystalline quartz, though the term is also used broadly for opaque silicified rocks. Red coloration commonly comes from hematite or goethite inclusions.

Field identification & locations

Identify it by its opaque red color, very fine texture, lack of cleavage, and ability to scratch glass; a streak test is usually pale red to brown. Acid causes no fizz, distinguishing it from many carbonate rocks.