metamorphic
Quartzite
Metamorphic Quartzite
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically grey, white, or pink with a vitreous to greasy luster. Composed of interlocking quartz crystals with a non-foliated structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically grey, white, or pink with a vitreous to greasy luster. Composed of interlocking quartz crystals with a non-foliated structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, commonly over hundreds of millions of years.
Uses & applications
Used extensively in construction, as crushed stone for roads, for railroad ballast, and occasionally as decorative dimension stone or countertops.
Geological facts
Quartzite is extremely resistant to weathering and chemical erosion, which is why ancient mountain ranges often leave behind quartzite ridges.
Field identification & locations
Can be identified in the field by its extreme hardness that scratches glass and its refusal to effervesce with hydrochloric acid; found globally in mountainous regions.
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