metamorphic
Quartzite
Metamorphosed Quartz Sandstone
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, white, or pinkish in color, vitreous to greasy luster, non-foliated crystal structure, lacks distinct cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray, white, or pinkish in color, vitreous to greasy luster, non-foliated crystal structure, lacks distinct cleavage, specific gravity around 2.65.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, typically through tectonic compression during orogeny, transforming the porous sandstone into a dense, interlocking mosaic of quartz crystals.
Uses & applications
Used widely in construction as crushed stone for road bases, railroad ballast, dimension stone for building facings, and in manufacturing refractory bricks and silica products.
Geological facts
Because quartz is extremely resistant to weathering, quartzite ridges often form prominent, rugged mountain peaks and ridges resistant to erosion.
Field identification & locations
Can be identified in the field by its hard, sugary texture where individual quartz grains do not break apart easily, contrasting with sandstone which easily crumbles into sand grains along cementing material.
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