metamorphic

Red jasper (likely brecciated or iron-stained jasper)

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

AI-generated identification · may be incorrect

Opaque, salmon-red to pink with gray-green patches and a dull to waxy luster; hardness about 6.5–7 Mohs, no visible cleavage, conchoidal fracture, and microcrystalline quartz structure. The rounded shape indicates natural water wear or tumbling.

Identified August 20, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal materials, with hematite/goethite producing red coloration; its age varies widely by deposit, commonly Precambrian to younger. This specimen may also be a jasper-rich volcanic or sedimentary cobble.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and polished stones; tougher material is occasionally used decoratively in tile or architectural accents. Common specimens have modest collector value.

Geological facts

Red jasper is a variety of opaque chalcedony rather than a separate mineral species. Green-gray areas may reflect altered volcanic minerals, clay, or epidote/chlorite.

Field identification & locations

Identify it by its opaque red color, quartz-like hardness, lack of cleavage, and fine-grained texture; a steel file should scratch it only with difficulty. Common sources include India, Madagascar, Brazil, Australia, and the western United States.