metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish in color, vitreous to greasy luster, massive to granular crystal structure, conchoidal fracture, and lack of distinct cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish in color, vitreous to greasy luster, massive to granular crystal structure, conchoidal fracture, and lack of distinct cleavage.
Formation & geological history
Formed from quartz-rich sandstone or chert under high temperature and pressure during regional or contact metamorphism, often dating from Precambrian to Phanerozoic eons.
Uses & applications
Used in construction, as crushed stone for road bases, in manufacturing railroad ballast, decorative aggregates, and occasionally for countertops and dimension stone.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich ridges often form prominent topographic highs.
Field identification & locations
Identified in the field by its hard, sugary texture, inability to be scratched by a steel knife, and a lack of effervescence when tested with hydrochloric acid. Found worldwide in mountain belts and ancient cratons.
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