metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or yellowish in color, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, and 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, typically white, gray, or yellowish in color, vitreous to greasy luster, massive crystal structure with interlocking quartz grains, conchoidal fracture, and specific gravity around 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or chert under high temperatures and tectonic pressures, often occurring during mountain-building events over millions of years.
Uses & applications
Used in construction, as crushed stone for roadbeds, railway ballast, manufacturing silica bricks, and occasionally as decorative stone or in countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich sandstones that undergo metamorphism often form prominent ridges and mountain peaks.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass easily, cannot be scratched by a knife), granular sugary texture on broken surfaces, and lack of reaction to acid. Commonly found worldwide in ancient mountain belts.
More like this
