mineral

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz, chiefly SiO₂; commonly sold as ocean jasper

AI-generated identification · may be incorrect

Opaque, polished silica-rich stone with cream, tan, and dark green-brown orbicular patterns; quartz hardness about 6.5–7 Mohs, vitreous to waxy luster, no visible cleavage. The image alone cannot confirm the exact variety; it may be another orbicular jasper or agate.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich volcanic rocks or hydrothermal fluids formed the fine-grained quartz and rounded mineral patterns; the polished pebble’s geological age and source cannot be determined from the image. Ocean jasper is famously sourced from Madagascar.

Uses & applications

Used for cabochons, beads, carvings, and collectible polished specimens; not generally used as a major construction material.

Geological facts

“Ocean jasper” is a trade name rather than a strict mineral species; its colorful circles and bands arise from differing mineral-rich zones.

Field identification & locations

Look for dense, smooth microcrystalline silica with rounded orbicular markings; hardness and acid tests can help distinguish it from softer imitations. Small polished pebbles commonly sell for about $5–$30, depending on pattern and quality.