metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, white to pinkish-gray color, and non-foliated granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, white to pinkish-gray color, and non-foliated granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under extreme heat and pressure deep within the Earth's crust.
Uses & applications
Commonly used in construction for road aggregate, railroad ballast, and decorative facing stone, as well as in countertops.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent ridges and resistant mountain peaks.
Field identification & locations
Identified by its inability to be scratched by a steel knife and its lack of effervescence when exposed to hydrochloric acid.
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