sedimentary

Weathered jasper-rich breccia

Silicified iron-rich breccia; primarily microcrystalline quartz (SiO₂) with iron oxides/hydroxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque gray, brown, ochre, and rust-red colors with earthy to subvitreous luster. The angular fragments and iron-stained matrix indicate brecciation and later silica cementation; cleavage is absent and fracture is uneven to conchoidal.

Identified August 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids cemented fractured volcanic or sedimentary rock, while weathering oxidized iron to limonite/goethite. Exact age and locality cannot be determined from the photograph; such material commonly forms in hydrothermal veins, iron-rich soils, and weathered volcanic terrains.

Uses & applications

Used mainly as a lapidary, carving, landscaping, or decorative stone; attractive pieces may be polished into cabochons. It has little industrial value compared with uniform quartzite or commercial jasper.

Geological facts

The rounded, polished-looking surface may result from natural weathering or tumbling, but the specimen still represents genuine geological material. Yellow-brown patches are probably iron oxides rather than native gold.

Field identification & locations

Identify by its great hardness, lack of cleavage, silica-like fracture, and resistance to scratching glass; a streak test and acid test can help exclude calcite. Common in oxidized mineralized zones and gravel deposits worldwide.