metamorphic
Quartzite
Metamorphic quartz sandstone
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or pink, vitreous to dull luster, non-foliated crystalline structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or pink, vitreous to dull luster, non-foliated crystalline structure.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during tectonic compression.
Uses & applications
Used in construction, railroad ballast, decorative aggregates, and occasionally as a dimension stone.
Geological facts
Quartzite is extremely resistant to weathering and often forms prominent mountain ridges.
Field identification & locations
Identified by its inability to be scratched by a steel knife and lack of acid reaction; found globally.
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