metamorphic
Polished orbicular jasper beads
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other inclusions
AI-generated identification · may be incorrectTypically Mohs 6.5–7; opaque, multicolored green, red, brown, gray, and cream, with a waxy to glassy polish and no visible cleavage. The circular patterns reflect mineral inclusions and brecciation; drilled holes indicate bead manufacture.
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Physical properties
Typically Mohs 6.5–7; opaque, multicolored green, red, brown, gray, and cream, with a waxy to glassy polish and no visible cleavage. The circular patterns reflect mineral inclusions and brecciation; drilled holes indicate bead manufacture.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic and sedimentary material, with iron and other minerals producing the colors and orbicular patterns. Deposits are commonly Phanerozoic, though exact age depends on locality.
Uses & applications
Used for jewelry, beads, cabochons, ornaments, and lapidary items; these are primarily decorative rather than construction stone.
Geological facts
The specimen appears to be tumbled and drilled, likely marketed as orbicular, ocean, or rainforest jasper; trade names can overlap and are not always scientifically standardized.
Field identification & locations
Identify by high polish, opaque silica-rich material, hardness sufficient to resist scratching by steel, and distinctive colored orbs. Common sources include Madagascar, Mexico, Australia, Indonesia, and the western United States.
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