metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale. Colors range from white and gray to pink, yellow, or orange due to iron oxide impurities. Exhibits a vitreous to greasy luster with a granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale. Colors range from white and gray to pink, yellow, or orange due to iron oxide impurities. Exhibits a vitreous to greasy luster with a granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically during mountain-building events over millions of years.
Uses & applications
Widely used in construction for durable dimension stone, heavy-duty countertops, road aggregate, and manufactured sand.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why ridges formed of quartzite often survive as high mountain peaks.
Field identification & locations
Identified easily by its inability to be scratched by a steel knife and its lack of effervescence when tested with dilute hydrochloric acid. Found globally in ancient fold mountain belts.
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