mineral

Red jasper

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

AI-generated identification · may be incorrect

Typically red to reddish-brown, opaque, with a dull to vitreous luster and no visible crystal faces; hardness about 6.5–7 Mohs, conchoidal fracture, and specific gravity near 2.6. The rounded, polished appearance indicates a tumbled or water-worn specimen.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement fine sediments or replace volcanic and other rocks, with iron producing the red color; deposits range from Precambrian to younger ages. Common in volcanic terrains, sedimentary iron-rich layers, and hydrothermal environments.

Uses & applications

Used for cabochons, beads, carvings, ornaments, decorative stone, and lapidary practice; occasionally used as a minor architectural or aggregate stone.

Geological facts

Jasper is technically a rock composed largely of microcrystalline quartz rather than a single mineral species. Color patterns can include brecciation, banding, orbicular textures, or dendritic manganese/iron markings.

Field identification & locations

Identify it by its opaque red color, strong polish, fine-grained texture, and lack of cleavage; it should scratch glass but not be scratched by a steel knife. Notable sources include India, Madagascar, Brazil, Australia, South Africa, and the western United States.