mineral

Polished brecciated jasper

Microcrystalline quartz (SiO₂) with hematite/goethite and pale chalcedony or feldspar inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque red-brown, cream, and gray, with vitreous-to-waxy luster and no visible cleavage. The angular contrasting patches indicate brecciation, cemented by silica and iron oxides.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

A silica-rich breccia formed when fractured volcanic or sedimentary material was cemented and replaced by chalcedony/quartz, with iron producing the red coloration. Formation ages vary widely by deposit, commonly Paleozoic to Cenozoic.

Uses & applications

Used for cabochons, tumbled stones, beads, carvings, and ornamental objects; attractive pieces have modest lapidary value.

Geological facts

Its patterns are natural mineral fragments rather than painted decoration; polishing enhances the contrast and luster.

Field identification & locations

Identify it by its opaque red matrix, cream angular clasts, high hardness, and inability to scratch with a steel blade easily; common sources include Oregon, Idaho, California, Australia, and Mexico. A definitive variety identification may require a specific-gravity, streak, or microscopic test.