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 and a non-foliated crystalline structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish with a vitreous to greasy luster and a non-foliated crystalline structure.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure during tectonic compression over millions of years.
Uses & applications
Used extensively in construction, railroad ballast, manufacturing of silica brick, and occasionally as an ornamental building stone.
Geological facts
Quartzite is extremely resistant to weathering and often forms prominent ridges and resistant mountain peaks.
Field identification & locations
Identify in the field by its inability to be scratched by steel and lack of effervescence with acid; commonly found globally in ancient mountain belts.
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