mineral

Red jasper

Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically opaque brick-red to reddish-brown with black or gray patches, vitreous to dull luster, no visible crystals, and conchoidal to uneven fracture. Hardness is about 6.5–7 Mohs; specific gravity is approximately 2.5–2.7.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities or replace volcanic and sedimentary rock, with iron producing the red color; specimens range from Precambrian to recent geological ages. Common sources include India, Brazil, Madagascar, the United States, and Australia.

Uses & applications

Used as ornamental stone, carvings, cabochons, beads, tumbled stones, and lapidary material; occasionally used for small decorative tiles or inlays.

Geological facts

Jasper is a dense, impure variety of chalcedony and may contain hematite, goethite, clay, or other inclusions. The pictured triangular piece appears rough-cut or naturally fractured rather than a crystal.

Field identification & locations

Identify it by its opaque red color, fine-grained texture, lack of cleavage, and ability to scratch glass; it should not show the translucent edges typical of many agates. Common rough or small polished pieces are usually worth about $2–$20, while unusually patterned quality specimens may reach $30–$100.