metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectHardness 7 on Mohs scale, typically white to gray or pink, vitreous to dull luster, non-foliated massive crystal structure.
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Physical properties
Hardness 7 on Mohs scale, typically white to gray or pink, vitreous to dull luster, non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under extreme heat and tectonic pressure.
Uses & applications
Used widely in construction, dimension stone, railroad ballast, and manufacture of silica brick.
Geological facts
Extremely resistant to weathering, quartzite ridges often form prominent mountain peaks and ridges.
Field identification & locations
Identify in the field by its hardness (scratches glass) and inability to fizz with hydrochloric acid.
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