metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors ranging from white to pink and reddish-brown, vitreous luster, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white to pink and reddish-brown, vitreous luster, and non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically over hundreds of millions of years.
Uses & applications
Used widely in construction for road aggregate, railroad ballast, and decorative stone, as well as in the manufacturing of silica bricks.
Geological facts
Quartzite is extremely resistant to weathering and chemical attack, which is why ancient quartz sandstone ridges often survive as prominent mountain crests.
Field identification & locations
Identify by its sugary texture on broken surfaces, high hardness that scratches glass easily, and lack of effervescence with acid. Found globally in mountainous and ancient craton regions.
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