mineral

Tumbled brecciated jasper or quartz-rich rock

Brecciated chalcedony/jasper, chiefly microcrystalline SiO₂ with iron-oxide or clay-rich matrix

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; rounded, polished pebble with cream-white angular fragments in a gray-green to brown matrix, waxy to dull luster, and no visible cleavage. Exact identification is uncertain from the photograph alone.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich material, commonly chalcedony or jasper, fractures and is cemented by later silica or iron-bearing fluids; ages vary widely by deposit. Tumbling has smoothed and polished the specimen.

Uses & applications

Used as an inexpensive lapidary and decorative stone for cabochons, beads, carvings, and display specimens; generally not used structurally.

Geological facts

The contrasting angular patches indicate brecciation rather than ordinary uniform jasper. A glassy appearance and conchoidal fracture would support chalcedony; earthy opacity suggests jasper.

Field identification & locations

Commonly found in volcanic terrains, hydrothermal veins, and sedimentary silica deposits, including the western United States, Mexico, Madagascar, and Australia. Test cautiously for a glass-scratching hardness and inspect fresh edges; acid testing is unnecessary.