metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically pink, purple, or gray with a vitreous to greasy luster and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically pink, purple, or gray with a vitreous to greasy luster and non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often occurring in mountain-building belts.
Uses & applications
Used widely in construction, railroad ballast, decorative aggregate, and occasionally for countertops and ornamental carvings.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it resists erosion better than surrounding rocks.
Field identification & locations
Identified by its hard, non-foliated texture that scratches glass and does not fizz with acid; commonly found globally in ancient orogenic zones.
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