mineral
Polished ocean jasper (orbicular jasper), probable
Silicified orbicular rhyolite; chiefly microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectCreamy tan, rounded and polished, with dark brown orbicular inclusions. Quartz-rich material is typically Mohs 6.5–7, with a waxy to vitreous luster and no visible cleavage; the image alone cannot confirm the exact variety.
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Physical properties
Creamy tan, rounded and polished, with dark brown orbicular inclusions. Quartz-rich material is typically Mohs 6.5–7, with a waxy to vitreous luster and no visible cleavage; the image alone cannot confirm the exact variety.
Formation & geological history
Formed as silica-rich volcanic rock, with later silica deposition and alteration creating orb-like patterns. Its geological age and precise source cannot be established from the photo; classic ocean jasper comes from Madagascar.
Uses & applications
Used for beads, cabochons, small carvings, and collecting; not generally an industrial or construction stone.
Geological facts
“Jasper” is a trade name for opaque, silica-rich material, not one precisely defined mineral species.
Field identification & locations
The polished surface and natural-looking inclusions indicate a geological specimen, but the small view is insufficient to distinguish ocean jasper from other orbicular jasper or silicified rock. Similar material is sold from Madagascar and other jasper localities.
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Mineral