metamorphic
Quartzite
Metamorphic Quartzite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, grayish-green color, vitreous to greasy luster, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, grayish-green color, vitreous to greasy luster, and non-foliated massive crystal structure.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure during tectonic metamorphism over millions of years.
Uses & applications
Used in construction as crushed stone for road bases, railroad ballast, and in manufacturing refractory bricks and countertops.
Geological facts
Quartzite is extremely resistant to weathering, which is why ancient quartz-rich mountain ranges often survive as modern ridges.
Field identification & locations
Identify in the field by its inability to be scratched by steel and lack of acid reaction; commonly found in mountain belts worldwide.
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