metamorphic
Quartzite
Metamorphic quartz arenite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray in color, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
Identified More metamorphic →
Explore Quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, typically white to gray in color, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
Formation & geological history
Formed under high heat and pressure when quartz-rich sandstone is metamorphosed, typically occurring in mountain-building belts over millions of years.
Uses & applications
Used widely in construction for road aggregate, railroad ballast, and building stone, as well as in the manufacture of silica brick and glass.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why ridges formed of quartzite often remain as prominent hills or mountain crests.
Field identification & locations
Can be identified in the field by its inability to be scratched by a steel knife and its tendency to break across quartz grains rather than around them.
More like this
