metamorphic
Quartzite
Metamorphic Quartz Arenite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and typically pink, gray, or brown color with visible interlocking quartz grains.
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, vitreous luster, conchoidal fracture, and typically pink, gray, or brown color with visible interlocking quartz grains.
Formation & geological history
Formed under high heat and pressure from quartz-rich sandstone during regional metamorphism, often billions of years old in ancient cratons.
Uses & applications
Used in construction, railroad ballast, manufacturing of silica bricks, and decorative landscaping or countertops.
Geological facts
Extremely durable and resistant to chemical weathering, quartzite frequently forms prominent ridges and resistant mountain peaks.
Field identification & locations
Commonly found in glaciated northern regions like Minnesota near 47.5°N, 94.9°W; easily identified by scratching glass and lack of reaction to acid.
More like this
