metamorphic

Polished brecciated jasper

Silicified microcrystalline quartz (SiO₂), commonly called brecciated or ocean jasper

AI-generated identification · may be incorrect

Mohs hardness about 6.5–7; opaque cream, brown, red, and gray, with waxy to vitreous polish. Microcrystalline quartz forms dense, non-cleavable masses; cavities and orbicular patterns are visible.

Identified September 10, 2026More metamorphic →

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Physical properties

Mohs hardness about 6.5–7; opaque cream, brown, red, and gray, with waxy to vitreous polish. Microcrystalline quartz forms dense, non-cleavable masses; cavities and orbicular patterns are visible.

Formation & geological history

Silica-rich volcanic or hydrothermal fluids cemented and replaced fractured rock, producing breccia, veins, and vugs; the exact geological age depends on locality, commonly Paleozoic–Cenozoic. The piece has been cut and highly polished.

Uses & applications

Used for cabochons, carvings, ornamental objects, and collectors’ specimens; rarely used as aggregate or decorative stone. Its value comes mainly from pattern, color, polish, and artistic shape.

Geological facts

The red coloration generally comes from iron oxides, while cream and gray areas may include chalcedony, quartz, clay minerals, or altered volcanic material. The sculptural form and complex cavities strongly suggest a lapidary carving rather than a natural fracture surface.

Field identification & locations

Identify by its very hard, opaque silica-rich body, conchoidal fracture, and resistance to scratching by steel; it should not show calcite-like fizz in weak acid. Comparable jasper occurs in Madagascar, Oregon, Indonesia, Mexico, and Australia, though locality cannot be confirmed visually.