mineral

Polished brecciated jasper

Brecciated jasper, an opaque microcrystalline quartz aggregate (SiO₂) with iron-oxide staining and cement

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque, with a waxy to glassy polish; this specimen shows cream, pink, maroon, and brown angular patches. Quartz is trigonal but cryptocrystalline, so individual crystals are not visible; cleavage is absent and specific gravity is about 2.6.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fragments, commonly volcanic or sedimentary material, are cemented and replaced by chalcedony or quartz, with hematite/goethite producing red-brown colors. Formation ages vary widely, commonly Paleozoic to Cenozoic depending on locality.

Uses & applications

Used for cabochons, beads, carvings, decorative stones, and lapidary specimens; occasionally used as ornamental aggregate. Small polished pieces generally have modest commercial value.

Geological facts

The angular contrasting fragments distinguish brecciated jasper from uniformly patterned jasper or agate. Red coloration usually reflects iron oxides rather than a separate red mineral.

Field identification & locations

Identify by its opaque appearance, very fine texture, colorful angular breccia pattern, lack of cleavage, and inability to scratch with a steel knife; quartz or glass can scratch it. Common sources include India, Madagascar, Brazil, Indonesia, and the western United States.