metamorphic
Quartzite
Metamorphic Quartz Sandstone (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to grey with yellowish or reddish iron staining, vitreous luster, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to grey with yellowish or reddish iron staining, vitreous luster, and non-foliated massive crystal structure.
Formation & geological history
Formed under intense heat and pressure from quartz-rich sandstone during regional or contact metamorphism.
Uses & applications
Used widely in construction, railroad ballast, decorative aggregates, and occasionally as a gemstone or ornamental stone.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it resists erosion better than surrounding rocks.
Field identification & locations
Identified by its inability to be scratched by steel and its tendency to fracture across quartz grains rather than around them. Found globally in ancient mountain belts.
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