mineral

Brecciated Agate / Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 Mohs. Luster: Waxy to vitreous. Color: Orange, reddish-brown, tan, cream, and grey mottling. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture.

Hardness: 6
Color: Orange, reddish-brown, tan, cream, and grey mottling
Luster: Waxy to vitreous

Identified July 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed when existing agate or jasper rock fractured due to tectonic activity or hydrothermal pressure, and was subsequently cemented together by secondary silica deposition, often enriched with iron oxides.

Uses & applications

Popular in jewelry making (cabochons, ring settings, beads), lapidary art, wire wrapping, and crystal collections.

Geological facts

Brecciation occurs when rocks are broken into angular fragments and re-cemented. The striking angular pattern creates unique, one-of-a-kind patterns in each tumbled stone.

Field identification & locations

Identified by its distinctive angular fragments (clasts) cemented in a finer silica matrix. Common in volcanic regions and ancient sedimentary beds, such as in the Western US, Brazil, and Madagascar.

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