metamorphic
Quartzite
Metamorphic Quartz Arenite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or pink, vitreous to greasy luster, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or pink, vitreous to greasy luster, and non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically during mountain-building events over millions of years.
Uses & applications
Used in construction, as crushed stone for roads, railroad ballast, and in the manufacture of silica brick and glass.
Geological facts
Quartzite is extremely resistant to weathering and often forms prominent mountain ridges. It fractures across the quartz grains rather than around them.
Field identification & locations
Identify in the field by its sugary texture, inability to be scratched by a steel knife, and failure to fizz with hydrochloric acid. Found globally in ancient mountain belts.
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