metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown, tan, or white with a vitreous to greasy luster and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, tan, or white with a vitreous to greasy luster and non-foliated massive crystal structure.
Formation & geological history
Formed through the thermal or regional metamorphism of quartz-rich sandstone under intense heat and pressure over millions of years.
Uses & applications
Used widely in construction as crushed stone, railway ballast, and dimension stone for building facades.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges.
Field identification & locations
Identify in the field by its sugary texture on broken surfaces and inability to be scratched by a steel knife; found globally in ancient orogenic belts.
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