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 purple, with a vitreous to greasy luster and a non-foliated granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white to gray, pink, or purple, with a vitreous to greasy luster and a non-foliated granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically occurring in mountain-building belts.
Uses & applications
Used in construction as crushed stone for road bases, railroad ballast, and as a decorative building stone or countertop material.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Identified by its inability to be scratched by a steel knife and its characteristic sugary texture on broken surfaces; commonly found worldwide.
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