sedimentary

Polished Porcelain Jasper

Jasper (microcrystalline quartz, SiO₂), commonly sold as Porcelain Jasper

AI-generated identification · may be incorrect

Typically opaque with cream, tan, brown, and mauve orbicular or brecciated patterns; waxy to glassy polish. Mohs hardness about 6.5–7, no cleavage, cryptocrystalline structure, and specific gravity near 2.6.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

A siliceous sedimentary material formed when microcrystalline quartz and chalcedony replace or cement fine sediments, often producing orbicular patterns from layered mineral growth. The specimen is likely Cretaceous-age material from Madagascar, though exact locality cannot be confirmed visually.

Uses & applications

Cut and polished for cabochons, palm stones, beads, carvings, and decorative objects; unsuitable as a major construction stone because it is typically sold in small pieces.

Geological facts

The concentric patches are caused by rhythmic silica deposition and contrasting iron- or manganese-bearing impurities. “Porcelain Jasper” is mainly a lapidary trade name rather than a strictly defined mineral species.

Field identification & locations

Identify it by its opaque porcelain-like cream base, rounded mauve-brown eyes, fine texture, and lack of visible individual crystals; a streak, hardness, and locality label improve confirmation. Common sources include Madagascar and parts of Mexico.