metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors range from white to pink and grey, 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, colors range from white to pink and grey, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, typically during mountain-building tectonic events.
Uses & applications
Used extensively in construction as crushed stone for road bases, railroad ballast, and in manufacturing silica brick and glass.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why ancient mountain ranges often leave behind quartzite ridges.
Field identification & locations
Easily identified in the field by its inability to be scratched by a steel knife and its characteristic sugary-textured surface of fused quartz grains.
More like this
