metamorphic
Tumbled red jasper (likely brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by hematite and iron oxides
AI-generated identification · may be incorrectOpaque brick-red to orange-brown with black manganese-oxide or iron-rich inclusions; dull to waxy luster, no visible crystals, conchoidal fracture, and Mohs hardness about 6.5–7. Specific gravity is approximately 2.5–2.7.
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Physical properties
Opaque brick-red to orange-brown with black manganese-oxide or iron-rich inclusions; dull to waxy luster, no visible crystals, conchoidal fracture, and Mohs hardness about 6.5–7. Specific gravity is approximately 2.5–2.7.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic sediment and other rocks, with iron oxides producing the red color; brecciation can create dark angular patterns. Formation ages vary widely, from Precambrian to younger volcanic environments.
Uses & applications
Used for cabochons, beads, carvings, tumbled stones, and decorative objects; it is also occasionally used as a minor ornamental stone in tile or inlay.
Geological facts
The specimen’s triangular shape and smooth edges indicate human tumbling or cutting rather than a natural crystal form. Red jasper is a variety of opaque chalcedony, not a separate mineral species.
Field identification & locations
Identify it by its opaque red body, black inclusions, glassy-waxy surface, and resistance to scratching by a steel knife; glass should not scratch it. Common sources include India, Brazil, Madagascar, Mexico, and the western United States.
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