metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, predominantly white to brown or grey in color, vitreous to greasy luster, non-foliated crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, predominantly white to brown or grey in color, vitreous to greasy luster, non-foliated crystal structure with interlocking quartz grains, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or chert under high temperatures and pressures deep within the Earth's crust, often dating from Precambrian to Cenozoic eras.
Uses & applications
Used in construction, as crushed stone for roadbeds, in manufacturing refractory bricks, for decorative dimension stone, and occasionally in lapidary work.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often persist as prominent hills or mountain crests.
Field identification & locations
Identified by its hard, sugary texture of interlocking grains that do not fizz with hydrochloric acid and will easily scratch glass. Found globally in mountain belts and ancient cratons.
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