metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or pinkish in color, with a vitreous to greasy luster. It has a non-foliated, interlocking crystalline structure and lacks distinct cleavage. Specific gravity ranges from 2.65 to 2.70.
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 pinkish in color, with a vitreous to greasy luster. It has a non-foliated, interlocking crystalline structure and lacks distinct cleavage. Specific gravity ranges from 2.65 to 2.70.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or chert under high heat and pressure, typically occurring in mountain-building belts.
Uses & applications
Used in construction, as crushed stone for road bases, in making railroad ballast, and occasionally as a decorative building stone or for countertops.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why quartz-rich ridges often stand out as high topography in landscapes.
Field identification & locations
Identified by its sandy texture fused into a solid mass, scratching glass easily due to high hardness, and not effervescing with dilute hydrochloric acid. Commonly found worldwide in mountain ranges and ancient cratons.
More like this
Other metamorphic specimens
Nephrite Jade
Nephrite
Mineral/Rock
Amphibolite
Amphibolite
metamorphic
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral