metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray in color, vitreous luster, and a non-foliated massive crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray in color, vitreous luster, and a non-foliated massive crystal structure with conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, commonly occurring in mountain-building belts.
Uses & applications
Used extensively in construction as crushed stone, dimension stone for architecture, and for manufacturing glass and refractory bricks.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges because it erodes slower than surrounding rocks.
Field identification & locations
Identified easily by its inability to be scratched by a steel knife and lack of fizzing with acid; found globally in ancient orogenic zones.
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