metamorphic
Quartzite
Metamorphosed quartz sandstone (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to gray color, vitreous to greasy luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, white to gray color, vitreous to greasy luster, and conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in mountain-building belts.
Uses & applications
Used in construction, railroad ballast, manufacturing of silica brick, and decorative landscaping.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges.
Field identification & locations
Identified by its inability to be scratched by a steel knife and lack of effervescence with acid; found worldwide.
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