mineral
Red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
