mineral

Polished brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), commonly called brecciated jasper

AI-generated identification · may be incorrect

Opaque reddish-brown, cream, and gray material with angular fragments and a waxy to dull luster; Mohs hardness about 6.5–7, no visible cleavage, microcrystalline quartz structure, and specific gravity near 2.6.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement fractured volcanic or sedimentary rock fragments, often with iron-oxide staining producing red and brown colors. Deposits are generally geologically young to ancient, depending on the host formation.

Uses & applications

Used for cabochons, carvings, beads, tumbled stones, bookends, and ornamental objects; usually valued as a decorative lapidary material rather than for industrial use.

Geological facts

The brecciated pattern results from broken fragments being recemented by chalcedony or jasper. Red coloration typically comes from hematite or other iron oxides.

Field identification & locations

Identify it by its opaque red-and-cream angular mosaic, glassy or waxy fracture, and resistance to scratching; it should not be scratched by a steel knife. Common sources include Oregon, Utah, Idaho, Madagascar, India, and Australia.