metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale; usually white, gray, or pinkish; vitreous to greasy luster; non-foliated massive crystal structure; conchoidal fracture; specific gravity around 2.65.
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; usually white, gray, or pinkish; vitreous to greasy luster; non-foliated massive crystal structure; conchoidal fracture; specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone under high temperature and pressure conditions associated with regional or contact metamorphism, often over millions of years.
Uses & applications
Used in construction, as crushed stone for roads, for railway ballast, in manufacturing refractory bricks, and occasionally as decorative stone or in countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why mountains made of quartzite often stand out as rugged ridges.
Field identification & locations
Can be identified in the field by its hardness (scratches glass easily), lack of significant foliation, and sugary texture where broken. Found globally in mountainous regions and ancient cratons.
More like this
