mineral

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

AI-generated identification · may be incorrect

Typically opaque red, brown, cream, and gray with angular fragments, earthy to waxy luster, and irregular fracture; Mohs hardness about 6.5–7, no cleavage, specific gravity ~2.6. The pictured specimen appears natural and rough, with weathered cavities.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements volcanic or sedimentary material, often filling fractures and brecciating earlier jasper. Formation ages vary widely; ocean jasper is chiefly associated with Oligocene volcanic rocks of Madagascar.

Uses & applications

Used as ornamental stone, cabochons, carvings, beads, and lapidary material; attractive patterned pieces are collected, while ordinary rough material has modest value.

Geological facts

Jasper is a variety of opaque chalcedony/microcrystalline quartz rather than a single mineral species. Red coloration generally comes from hematite or other iron oxides.

Field identification & locations

Identify by its opaque, very hard silica-rich body, muted red coloration, and brecciated pattern; it should resist scratching by a steel knife. Common sources include Madagascar, Oregon, Idaho, India, Brazil, and Australia; definitive identification may require a hardness or chemical test.