metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, white, or reddish-brown with a vitreous to greasy luster and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray, white, or reddish-brown with a vitreous to greasy luster and non-foliated massive crystal structure.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, commonly dating from the Precambrian to Cenozoic eras.
Uses & applications
Used extensively in construction, as crushed stone for road bases, and occasionally as a decorative building stone or for countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges because it outlasts surrounding rocks.
Field identification & locations
Identify by its ability to scratch glass and lack of effervescence when tested with hydrochloric acid; found globally in mountainous or ancient craton regions.
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