metamorphic
Quartzite
Metamorphic quartz arenite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray or white with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray or white with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, commonly originating in mountain-building zones.
Uses & applications
Used widely in construction as crushed stone, railroad ballast, dimension stone, and decorative landscaping.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, which is why ridges formed of quartzite often remain as prominent hills.
Field identification & locations
Can be identified in the field by its inability to be scratched by a steel knife and its tendency to fracture across rather than around quartz grains.
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