gemstone

Tumbled brecciated jasper

Brecciated jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and varied silicate fragments

AI-generated identification · may be incorrect

Typically opaque, with rusty red-brown, cream, gray, or purple angular patterns; vitreous to waxy luster and no visible cleavage. Hardness is about 6.5–7 Mohs, with specific gravity near 2.6; the specimen appears polished/tumbled.

Identified August 19, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement fragmented volcanic or sedimentary rock, often with iron oxides producing red-brown colors. It is commonly Cenozoic to older, depending on the host deposit.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; it has little industrial use beyond decorative aggregate.

Geological facts

The brecciated appearance comes from angular rock fragments cemented by chalcedony or jasper. Individual pieces can vary greatly because “brecciated jasper” is a broad lapidary trade name.

Field identification & locations

Identify it by its opaque, mosaic-like angular fragments, silica hardness, and inability to scratch easily with a steel knife; common sources include India, Madagascar, Brazil, and the western United States. Exact identification would require testing or microscopy.