sedimentary
Brecciated Quartz
Silicon Dioxide (SiO2) with iron oxide cement
Hardness of 7 on the Mohs scale, vitreous to dull luster, white and pinkish-red coloration due to iron staining, conchoidal fracture, and a specific gravity of around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to dull luster, white and pinkish-red coloration due to iron staining, conchoidal fracture, and a specific gravity of around 2.65.
Formation & geological history
Formed when existing rock or quartz veins are fractured by tectonic forces and the fragments are subsequently cemented back together by silica or iron-rich mineral solutions.
Uses & applications
Used primarily in lapidary arts, decorative stone carving, tumbling, and as collector specimens.
Geological facts
The red and brown web-like patterns are caused by iron oxide (hematite or goethite) seeping into the fractures after the initial rock was broken apart.
Field identification & locations
Easily identified by its angular, broken fragments (clasts) cemented together in a contrasting matrix, commonly found in fault zones and river gravels.
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