metamorphic
Quartzite
Metamorphic Quartz Arenite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to grey or pinkish in color, vitreous to greasy luster, massive crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to grey or pinkish in color, vitreous to greasy luster, massive crystal structure with conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, commonly occurring in mountain-building belts.
Uses & applications
Used in construction, as crushed stone for road bases, in railway ballast, and occasionally as a decorative building 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
Identified by its inability to be scratched by a steel knife and lack of fizzing with acid; found globally in ancient orogenic zones.
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