mineral

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, orange, red, and brown patches with a waxy to vitreous polish. Irregular brecciation and quartz-rich microcrystalline structure; no visible cleavage, specific gravity about 2.5–2.7.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement fractured volcanic or sedimentary rock, with iron oxides producing the warm colors. Usually Phanerozoic, though exact age depends on locality.

Uses & applications

Used for cabochons, carvings, tumbled stones, spheres, ornamental objects, and lapidary specimens; generally not an industrial aggregate in polished form.

Geological facts

The angular cream and red domains suggest brecciation, while translucent edges and conchoidal fracture support chalcedonic quartz. Similar material is sold under locality or trade names such as brecciated jasper or red jasper.

Field identification & locations

Identify by its opaque patterned body, quartz-like hardness, lack of cleavage, and resistance to scratching by steel; a glass scratch test is more diagnostic. Common sources include Oregon, Idaho, Utah, Madagascar, Brazil, and Australia.