metamorphic
Quartzite
Metamorphic quartz sandstone
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or brown with a vitreous to greasy luster. Massive interlocking crystalline structure with no visible cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or brown with a vitreous to greasy luster. Massive interlocking crystalline structure with no visible cleavage.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone subjected to high heat and tectonic pressure, typically over millions of years.
Uses & applications
Used in construction, railroad ballast, crushed stone for road surfaces, and occasionally as decorative stone or countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges.
Field identification & locations
Identified by its inability to be scratched by a steel knife and lack of effervescence with acid. Found worldwide in ancient mountain belts.
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