metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with iron oxide staining, vitreous to greasy luster, massive crystal structure, lacks visible cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with iron oxide staining, vitreous to greasy luster, massive crystal structure, lacks visible cleavage, specific gravity of 2.65.
Formation & geological history
Formed when quartz-rich sandstone or chert is subjected to high heat and pressure, typically through tectonic compression in orogenic belts.
Uses & applications
Used in construction, as crushed stone for roadbeds, decorative aggregate, and occasionally for countertops and monument building.
Geological facts
Because quartz is extremely resistant to weathering, quartzite mountains often form the highest ridges and peaks in a region.
Field identification & locations
Identified by its high hardness (scratches glass), sugary texture on fractured surfaces, and lack of fizz when tested with hydrochloric acid. Found worldwide in ancient mountain belts.
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