metamorphic
Quartzite
Metamorphic Quartzite
Hardness of 7 on the Mohs scale, typically white to gray in color, vitreous to greasy luster, non-foliated massive crystal structure, poor cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray in color, vitreous to greasy luster, non-foliated massive crystal structure, poor cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high temperatures and pressures, commonly occurring during mountain-building tectonic events.
Uses & applications
Used in construction, as crushed stone for roadbeds, in manufacturing railroad ballast, for making decorative aggregate, and in high-purity silica products.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why ridges formed of quartzite often survive as prominent hills or mountain crests.
Field identification & locations
Can be identified in the field by its extreme hardness (scratches glass easily), the sugary texture of broken surfaces where quartz grains fracture through rather than around, and lack of reaction to acid.
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