metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or purple, vitreous to greasy luster, trigonal crystal system when individual crystals form, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or purple, vitreous to greasy luster, trigonal crystal system when individual crystals form, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed from quartz-rich sandstone or chert through regional or contact metamorphism involving intense heat and pressure, typically occurring over millions of years.
Uses & applications
Used in construction, as crushed stone for road bases, in manufacturing glass and ceramics, and as dimension stone.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges made of quartzite often form prominent hills or mountain ranges.
Field identification & locations
Can be identified by its inability to be scratched by a steel knife and its lack of effervescence with hydrochloric acid. Commonly found in mountainous regions worldwide.
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