mineral

Polished brecciated jasper

Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, gray, tan, and reddish-brown fragments in a silica-rich matrix; generally waxy to dull luster, massive structure, and no obvious cleavage. The rounded form appears naturally water-worn or tumbled/polished.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed when fractured rock fragments were cemented by silica-rich fluids, often with later iron-oxide staining. Jasper commonly formed in volcanic or sedimentary environments, generally from Precambrian through younger geologic ages.

Uses & applications

Used as an ornamental stone, cabochons, carvings, tumbled stones, and lapidary material; unsuitable for most structural construction because of variable composition.

Geological facts

Its angular contrasting fragments indicate brecciation, while the red-brown colors commonly reflect hematite or goethite. Exact identification would require a fresh edge, hardness testing, and possibly microscopy.

Field identification & locations

Identify by its opaque silica-rich body, strong resistance to scratching, conchoidal fracture, and patchy breccia pattern; common sources include the western United States, Mexico, Australia, and India. Avoid confusing it with dyed breccia or concrete.