metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors range from white to pink and orange due to iron oxide impurities, vitreous to greasy luster, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, colors range from white to pink and orange due to iron oxide impurities, vitreous to greasy luster, and non-foliated massive crystal structure.
Formation & geological history
Formed under high heat and pressure from quartz-rich sandstone during regional or contact metamorphism over millions of years.
Uses & applications
Used extensively in construction, as crushed stone for roads, for railroad ballast, and occasionally as a decorative dimension stone or in countertops.
Geological facts
Quartzite is extremely resistant to weathering and chemical erosion, which is why ancient quartz sandstone ridges often survive as prominent mountain crests.
Field identification & locations
Can be identified in the field by its sugary texture, inability to be scratched by steel, and the fact that it fractures across quartz grains rather than around them.
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