metamorphic
Tumbled jasper pebble
Silica-rich microcrystalline quartz/chalcedony, commonly brecciated or iron-stained jasper (SiO₂)
AI-generated identification · may be incorrectOpaque brown-gray with cream to orange fracture or vein patterns; dull to waxy luster, cryptocrystalline structure, no visible cleavage, and estimated Mohs hardness 6.5–7. Specific gravity is about 2.5–2.7.
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Physical properties
Opaque brown-gray with cream to orange fracture or vein patterns; dull to waxy luster, cryptocrystalline structure, no visible cleavage, and estimated Mohs hardness 6.5–7. Specific gravity is about 2.5–2.7.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or brecciated rock, with iron oxides producing the earthy colors. The pictured piece is likely naturally rounded or tumbled; its exact geologic age and locality cannot be determined from the image.
Uses & applications
Used for ornamental stone, cabochons, beads, carvings, tumbled stones, and lapidary pieces; unsuitable as a major construction stone because of its small size.
Geological facts
The cream-orange lines may be quartz or calcite veins, or cemented breccia boundaries. Jasper is a variety of opaque chalcedony and can resemble chert, petrified wood, or iron-rich rhyolite.
Field identification & locations
Identify it by its opaque appearance, very fine grain, hardness, and resistance to scratching by steel; quartz veins commonly contrast with the matrix. Common sources include India, Madagascar, Brazil, Australia, and the western United States.
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