metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, typically white to grey with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
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Physical properties
Hardness of 7 on Mohs scale, typically white to grey with a vitreous to greasy luster, massive crystal structure, and lacks distinct cleavage.
Formation & geological history
Formed under high heat and pressure from quartz sandstone during regional metamorphism, often originating in ancient mountain-building events.
Uses & applications
Used in construction, railway ballast, manufacturing of silica bricks, and occasionally as an ornamental countertop material.
Geological facts
Quartzite is extremely weather-resistant and often forms prominent mountain ridges because it resists erosion better than surrounding rocks.
Field identification & locations
Identify in the field by its extreme hardness, sugary texture on fractured surfaces, and failure to scratch with a steel knife.
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