sedimentary
Quartz Breccia
Brecciated Quartz Clasts in Siliceous/Sandy Matrix
Hardness: 7 (Mohs scale), Color: White to translucent clasts with tan/brown matrix, Luster: Vitreous to dull, Structure: Angular rock fragments (clasts) cemented together, Specific Gravity: approx. 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent clasts with tan/brown matrix, Luster: Vitreous to dull, Structure: Angular rock fragments (clasts) cemented together, Specific Gravity: approx. 2.65
Formation & geological history
Formed by the mechanical breaking of quartz veins or rocks along fault zones or through landslide activity, followed by cementation by silica or fine sediments. Often found in tectonic or hydrothermal environments.
Uses & applications
Primarily used as an indicator for geological faulting; can be used as decorative stone, crushed stone for construction, or landscape gravel.
Geological facts
The word 'breccia' comes from the Italian for 'rubble' or 'loose gravel.' Unlike conglomerate, Which has rounded clasts, breccia is defined by its sharp, angular fragments.
Field identification & locations
Identify by looking for angular, broken white quartz fragments held together by a different colored matrix. It is commonly found near old fault lines or hydrothermal vein sites.
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