metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown, tan, or white with a vitreous to greasy luster. It features a non-foliated massive crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, tan, or white with a vitreous to greasy luster. It features a non-foliated massive crystal structure with conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure over millions of years.
Uses & applications
Used widely in construction as crushed stone for road bases, railroad ballast, and decorative facing stone, as well as in manufacturing refractories.
Geological facts
Quartzite is extremely resistant to weathering and chemical breakdown, which is why ancient quartz sandstone ridges often survive as prominent mountain peaks.
Field identification & locations
Identify in the field by its sugary texture on broken surfaces and its ability to easily scratch glass due to its high quartz content. Found globally in ancient mountain belts.
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