metamorphic
Quartzite
Metamorphic Quartz Sandstone (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, vitreous luster, white to gray color, and conchoidal fracture. Composed predominantly of interlocking quartz grains.
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Physical properties
Hardness of 7 on Mohs scale, vitreous luster, white to gray color, and conchoidal fracture. Composed predominantly of interlocking quartz grains.
Formation & geological history
Formed through the regional or contact metamorphism of quartz-rich sandstone under intense heat and pressure over millions of years.
Uses & applications
Used extensively in construction as crushed stone for road bases, dimension stone for building, and in manufacturing refractories.
Geological facts
Quartzite is exceptionally weather-resistant, which is why ridges formed of quartzite often persist as prominent mountain crests.
Field identification & locations
Identified easily by its inability to be scratched by a knife and its failure to effervesce with dilute hydrochloric acid. Found globally worldwide.
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