metamorphic
Red jasper (likely brecciated or iron-stained jasper)
Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides
AI-generated identification · may be incorrectOpaque, 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.
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Physical properties
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.
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.
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