metamorphic
Quartzite
Metamorphic Quartz Sandstone
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, colors range from white to gray and pink, vitreous to greasy luster, non-foliated crystal structure.
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Physical properties
Hardness of 7 on Mohs scale, colors range from white to gray and pink, vitreous to greasy luster, non-foliated crystal structure.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure through tectonic metamorphism.
Uses & applications
Used extensively as crushed stone in construction, decorative aggregates, and occasionally for countertops.
Geological facts
Quartzite is exceptionally durable and weather-resistant, often forming prominent mountain ridges because it resists erosion better than surrounding rocks.
Field identification & locations
Identified by its hard, interlocking quartz grains that do not fizz with hydrochloric acid and will easily scratch glass. Found worldwide in mountain belts.
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