metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish in color, with a vitreous to greasy luster. It has a non-foliated, interlocking crystalline structure and lacks distinct cleavage. Specific gravity ranges from 2.65 to 2.70.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish in color, with a vitreous to greasy luster. It has a non-foliated, interlocking crystalline structure and lacks distinct cleavage. Specific gravity ranges from 2.65 to 2.70.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or chert under high heat and pressure, typically occurring in mountain-building belts.
Uses & applications
Used in construction, as crushed stone for road bases, in making railroad ballast, and occasionally as a decorative building stone or for countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich ridges often stand out as high topography in landscapes.
Field identification & locations
Identified by its sandy texture fused into a solid mass, scratching glass easily due to high hardness, and not effervescing with dilute hydrochloric acid. Commonly found worldwide in mountain ranges and ancient cratons.
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