metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white or gray color, vitreous to greasy luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white or gray color, vitreous to greasy luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz sandstone under intense heat and pressure, typically during tectonic mountain-building events.
Uses & applications
Used widely in construction, railroad ballast, decorative aggregates, and occasionally as dimension stone or for countertops.
Geological facts
Quartzite is extremely resistant to weathering and erosion, often forming prominent mountain ridges and durable clasts in riverbeds.
Field identification & locations
Identified by its hard, sugary texture and failure to break around quartz grains when fractured; common globally in ancient orogenic belts.
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