metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster. It features a non-foliated massive crystal structure with conchoidal fracture and specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster. It features a non-foliated massive crystal structure with conchoidal fracture and specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, typically during mountain-building events.
Uses & applications
Used widely in construction, railroad ballast, decorative landscaping, and occasionally as a durable dimension stone for countertops.
Geological facts
Quartzite is extremely resistant to weathering and chemical erosion, which is why ancient sandstone ridges often survive as jagged quartzite mountain crests.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife and the way it breaks across quartz grains rather than around them. Found globally in ancient orogenic belts.
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