mineral
Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image
AI-generated identification · may be incorrectPolished, rounded stone with cream, tan, and muted green-brown patches and possible orbicular patterns. Quartz-rich jasper is typically Mohs 6.5–7, opaque, and has a vitreous-to-waxy luster; its crystals are microscopic.
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Physical properties
Polished, rounded stone with cream, tan, and muted green-brown patches and possible orbicular patterns. Quartz-rich jasper is typically Mohs 6.5–7, opaque, and has a vitreous-to-waxy luster; its crystals are microscopic.
Formation & geological history
Forms when silica-rich fluids fill or replace rock, later acquiring colored mineral inclusions; the specimen’s age and precise formation setting cannot be determined visually. Ocean jasper is notably sourced from Madagascar.
Uses & applications
Commonly cut and polished for spheres, cabochons, beads, and decorative objects; not generally used as an industrial building stone.
Geological facts
Jasper is an opaque variety of chalcedony, a microcrystalline form of quartz. The pictured object appears to be a polished sphere, though its specific jasper variety is uncertain.
Field identification & locations
Look for opaque silica-rich material, mottled colors, and any repeated rounded orb patterns; hardness and a glass-scratching test can help distinguish it from softer imitations. Orbicular jasper is found in several localities, including Madagascar, but appearance alone cannot establish provenance.
