mineral

Polished orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂; precise variety uncertain from the photo

AI-generated identification · may be incorrect

Opaque, polished stone with cream, blue-green, and rusty-brown patches; quartz hardness about 6.5–7, vitreous to waxy luster, microcrystalline structure, and no visible cleavage. The rounded, contrasting patches suggest orbicular patterning.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich volcanic material altered and deposited in cavities or fractures, then silicified; such jasper formed in varied geological periods. Ocean jasper is classically associated with Madagascar’s Miocene volcanic rocks.

Uses & applications

Collected as a polished specimen or used for beads, cabochons, and other ornamental work; not typically a major industrial stone.

Geological facts

“Jasper” is an opaque variety of chalcedony, and orbicular patterns arise from concentric mineral growth or replacement. A photo cannot confirm the specific jasper locality or variety.

Field identification & locations

Look for hardness, opaque silica-rich texture, and distinctive rounded or mottled color patterns; it may scratch glass and resist a steel blade. Similar polished jaspers occur worldwide, while classic ocean jasper comes from Madagascar.