metamorphic
Quartzite
Metamorphic Quartzite
AI-generated identification · may be incorrectMohs hardness of 7, vitreous to greasy luster, variable colors including white, gray, and pink, with a non-foliated massive crystal structure.
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Physical properties
Mohs hardness of 7, vitreous to greasy luster, variable colors including white, gray, and pink, with a non-foliated massive crystal structure.
Formation & geological history
Formed under high heat and pressure from quartz-rich sandstone during regional or contact metamorphism.
Uses & applications
Used extensively in construction as crushed stone, railroad ballast, and decorative facing, as well as for countertops.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it resists erosion better than surrounding rocks.
Field identification & locations
Can be identified by its inability to be scratched by steel and its failure to fizz with hydrochloric acid; found globally in ancient mountain belts.
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