metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors ranging from white to gray, pink, or yellow, vitreous to greasy luster, and a non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white to gray, pink, or yellow, vitreous to greasy luster, and a non-foliated massive crystal structure.
Formation & geological history
Formed under intense heat and pressure from quartz-rich sandstone, typically in convergent plate boundary mountain-building events over millions of years.
Uses & applications
Used widely in construction for road aggregate, railroad ballast, dimension stone, and manufactured countertops due to its extreme durability.
Geological facts
Quartzite is harder than the original sandstone it formed from and will fracture across the quartz grains rather than around them.
Field identification & locations
Identified by its scratch resistance to steel and glass along with a sugary, granular textured surface; common in mountainous regions worldwide.
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