metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors ranging from white and gray to pink or green, vitreous to greasy luster, non-foliated massive crystal structure, and a specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white and gray to pink or green, vitreous to greasy luster, non-foliated massive crystal structure, and a specific gravity of 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically during mountain-building tectonic events over hundreds of millions of years.
Uses & applications
Used extensively in construction for road aggregate, railroad ballast, and building stone, as well as in the manufacture of silica brick and metallurgical flux.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often survive as prominent hills or mountain crests.
Field identification & locations
Identified by its hard, non-foliated texture and the inability to scratch quartz crystals with a steel knife; found worldwide in major mountain belts and ancient cratons.
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