metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, typically white to gray or pink, vitreous to greasy luster, non-foliated crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on Mohs scale, typically white to gray or pink, vitreous to greasy luster, non-foliated crystal structure with conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz sandstone under intense heat and pressure deep within the Earth's crust.
Uses & applications
Used extensively in construction, railroad ballast, manufacturing of silica bricks, and occasionally as an ornamental decorative stone.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often survive as prominent hills.
Field identification & locations
Can be identified by its inability to be scratched by a steel knife and lack of effervescence with hydrochloric acid. Found globally in ancient mountain belts.
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