mineral

Red jasper (tumbled)

Microcrystalline quartz/chalcedony, SiO₂, colored chiefly by iron oxides

AI-generated identification · may be incorrect

Typically opaque brick-red to reddish brown with black or gray patches, vitreous-to-waxy luster, no visible crystals, and conchoidal fracture; Mohs hardness 6.5–7, specific gravity about 2.6. The rounded, glossy surface indicates tumbling and polishing.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediments, often incorporating iron oxides that create the red color; deposits range from Precambrian to much younger ages. Common sources include volcanic and sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, ornamental stone, and inexpensive polished specimens; historically used for tools and decorative objects.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, unlike transparent crystalline quartz. Color and pattern are controlled by hematite, goethite, clay, and other inclusions.

Field identification & locations

Identify it by its red-brown opaque body, strong hardness, lack of cleavage, and resistance to scratching by steel; a glassy or softer look-alike may be dyed material. Common localities include India, Madagascar, Brazil, Australia, South Africa, and the western United States.