Quartz breccia is a rock made up of angular fragments of quartz that have been broken and re-cemented, usually by silica (and sometimes sulphides, iron oxides, or carbonate). What it means geologically A. Brecciation = brittle fracturing due to tectonic stress, faulting, shearing, or hydrothermal fluid pressure. B. The broken quartz fragments (clasts) are later cemented by quartz or mineral-rich fluids. C. Common in fault zones, shear zones, and vein systems. Why it matters in mineral exploratio