metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray in color, with a vitreous to greasy luster and a non-foliated, dense crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray in color, with a vitreous to greasy luster and a non-foliated, dense crystal structure.
Formation & geological history
Formed under intense heat and pressure from quartz-rich sandstone during regional or contact metamorphism.
Uses & applications
Used widely in construction, railroad ballast, crushed stone, decorative aggregate, and occasionally in the manufacture of silica brick and glass.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Identify by its non-foliated texture and the inability of a steel knife to scratch its surface. Commonly found in mountainous regions worldwide.
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