metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown, pink, or white in color with a vitreous to greasy luster and non-foliated granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, pink, or white in color with a vitreous to greasy luster and non-foliated granular crystal structure.
Formation & geological history
Formed when quartz-rich sandstone or chert is subjected to high heat and pressure associated with tectonic compression, typically over millions of years.
Uses & applications
Used extensively as crushed stone in construction, railroad ballast, dimension stone, and occasionally for decorative landscaping and countertops.
Geological facts
Quartzite is extremely durable and weather-resistant, often outlasting the mountains it forms due to its high resistance to chemical weathering.
Field identification & locations
Identified easily by its inability to be scratched by a knife and lack of effervescence with acid; commonly found in mountain belts worldwide.
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