metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray to brownish-white in color, with a vitreous to greasy luster and non-foliated granular structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray to brownish-white in color, with a vitreous to greasy luster and non-foliated granular structure.
Formation & geological history
Formed through the thermal metamorphism of quartz-rich sandstone under intense heat and pressure deep within the Earth's crust.
Uses & applications
Used widely in construction as crushed stone for road bases, railway ballast, and in manufacturing silica brick and glass.
Geological facts
Quartzite is extremely resistant to weathering and erosion, often forming the ridge tops and prominent peaks of mountain ranges.
Field identification & locations
Identified easily by its inability to be scratched by a steel knife and lack of fizzing with acid; commonly found in mountainous fold belts worldwide.
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