metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or yellowish-brown, vitreous to greasy luster, non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or yellowish-brown, vitreous to greasy luster, non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, commonly over hundreds of millions of years.
Uses & applications
Used in construction, as crushed stone for road bases, in manufacturing refractory bricks, and occasionally as an ornamental decorative stone.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges. It fractures through the quartz grains rather than around them.
Field identification & locations
Identified by its hard glassy surface that scratches glass and does not fizz with hydrochloric acid. Found globally in ancient mountain belts.
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