metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or reddish, with a vitreous to greasy luster and a non-foliated, granular structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or reddish, with a vitreous to greasy luster and a non-foliated, granular structure.
Formation & geological history
Formed under intense heat and pressure from quartz-rich sandstone during regional or contact metamorphism, often over millions of years.
Uses & applications
Used extensively in construction as crushed stone, for railroad ballast, in decorative wall facings, and occasionally as dimension stone.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, which is why ancient mountain ranges often weather into quartzite ridges.
Field identification & locations
Identify in the field by its hardness (scratches glass easily) and the fused quartz grains that break across the grains rather than around them.
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