metamorphic
Tumbled jasper, likely red/brown jasper
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
AI-generated identification · may be incorrectOpaque, reddish-brown to tan with a dull-to-waxy luster and fine-grained texture; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. The rounded edges indicate natural or commercial tumbling/polishing.
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Physical properties
Opaque, reddish-brown to tan with a dull-to-waxy luster and fine-grained texture; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. The rounded edges indicate natural or commercial tumbling/polishing.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or altered rock, with iron oxides producing the red-brown colors. Its age depends on locality, commonly ranging from Precambrian to younger volcanic or sedimentary settings.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and ornamental objects; lesser-quality material is inexpensive lapidary stock.
Geological facts
Jasper is a variety of opaque chalcedony rather than a single mineral species. Color patterns and names such as red jasper, picture jasper, and brecciated jasper often reflect locality and appearance.
Field identification & locations
Identify it by its opaque silica-rich body, earthy red coloration, glassy/waxy broken surfaces, and resistance to scratching; it should not be scratched easily by a steel knife. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.
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