metamorphic
Quartzite
Metamorphic quartz rock (SiO2)
Hardness of 7 on the Mohs scale, color ranges from white and gray to pink or yellowish due to iron impurities, vitreous to greasy luster, non-foliated crystal structure, lacks distinct cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, color ranges from white and gray to pink or yellowish due to iron impurities, vitreous to greasy luster, non-foliated crystal structure, lacks distinct cleavage, specific gravity of 2.65.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, typically during tectonic compression associated with mountain building events (regional metamorphism).
Uses & applications
Used in construction, as crushed stone for roadbeds, as decorative aggregate, in the manufacturing of refractory bricks, and occasionally as a dimension stone or countertop material.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why mountains made of quartzite often stand out as high ridges or peaks.
Field identification & locations
Identified in the field by its sugary texture of interlocking quartz crystals, inability to be scratched by a knife, and the fact that it breaks across the quartz grains rather than around them like sandstone. Found worldwide.
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