sedimentary
Brecciated jasper
Silicified microcrystalline quartz (SiO₂), commonly iron-stained and brecciated
AI-generated identification · may be incorrectTypically Mohs 6.5–7, opaque, with a dull to waxy luster and red-brown, gray, tan, and cream colors. It consists of cryptocrystalline quartz/chalcedony fragments and has no obvious cleavage; cavities and fractures are common.
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Physical properties
Typically Mohs 6.5–7, opaque, with a dull to waxy luster and red-brown, gray, tan, and cream colors. It consists of cryptocrystalline quartz/chalcedony fragments and has no obvious cleavage; cavities and fractures are common.
Formation & geological history
Forms when silica-rich fluids cement and replace fractured volcanic or sedimentary material, with iron oxides producing the red-brown coloration. Formation ages vary widely, commonly Paleozoic to Cenozoic depending on the deposit.
Uses & applications
Used for cabochons, beads, carvings, lapidary pieces, and decorative stone; poorer material is a collector specimen or landscaping stone.
Geological facts
The contrasting angular gray and red zones reflect brecciation and later silica cementation, rather than a single uniform mineral crystal.
Field identification & locations
Identify it by testing for hardness near quartz, opaque coloration, waxy fracture, and resistance to scratching by a steel knife; common sources include volcanic terrains in the western United States, Mexico, Australia, and India.
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