mineral

Red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque brick-red to brown, dull to slightly vitreous luster, commonly massive with no visible crystals; Mohs hardness about 6.5–7, conchoidal to uneven fracture, and specific gravity near 2.6. The pale vein may be quartz or chalcedony.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sedimentary and volcanic material, with iron oxides producing the red color; deposits range from Precambrian to younger ages. Commonly associated with volcanic terrains and iron-rich sedimentary rocks.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and tumbled stones; historically used for tools and small decorative objects. Ordinary rough pieces have modest collector value.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz rather than a single mineral species. Its patterns and red coloration result from hematite, goethite, or related iron minerals.

Field identification & locations

Identify it by its opaque red color, fine-grained texture, hardness, and inability to scratch with a steel knife easily; a white vein and waxy/conchoidal fracture support quartz-rich jasper. Found worldwide, notably India, Madagascar, Brazil, Australia, and the western United States.