gemstone

Tumbled Ocean Jasper (likely orbicular jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; pink, salmon, gray, and green coloration with opaque, waxy-to-vitreous luster. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.6.

Identified August 16, 2026More gemstone →

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Physical properties

Hardness 6.5–7 Mohs; pink, salmon, gray, and green coloration with opaque, waxy-to-vitreous luster. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.6.

Formation & geological history

Formed when silica-rich fluids replaced or filled cavities in volcanic rock, producing patterned chalcedony and jasper; Madagascar material is commonly Cenozoic, though exact age depends on locality. The specimen is polished/tumbled.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and mineral collections. Its appeal comes from contrasting colors and orbicular or scenic patterns.

Geological facts

Ocean jasper is a trade name, not a single officially defined mineral species; green areas may contain chlorite or other minerals, while red and pink tones commonly reflect iron oxides.

Field identification & locations

Identify by its opaque, fine-grained quartz texture, waxy polish, and irregular multicolor patterns; it should not show glassy transparency or strong cleavage. Common sources include Madagascar, especially coastal deposits.