metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown or tan in weathered forms, vitreous to greasy luster, non-foliated granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown or tan in weathered forms, vitreous to greasy luster, non-foliated granular crystal 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 extensively in construction, as crushed stone for roads, and occasionally in decorative architecture and countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges where softer surrounding rocks erode.
Field identification & locations
Identify in the field by its inability to be scratched by a knife and the way it breaks across rather than around quartz grains. Found globally in ancient mountain belts.
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