metamorphic
Quartzite
Quartzite (mostly SiO2)
Hardness: 7 (Mohs scale), Color: tan to creamy white with iron staining, Luster: vitreous to dull, Crystal structure: granoblastic (interlocking quartz grains), Cleavage: none.
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Physical properties
Hardness: 7 (Mohs scale), Color: tan to creamy white with iron staining, Luster: vitreous to dull, Crystal structure: granoblastic (interlocking quartz grains), Cleavage: none.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High heat and pressure cause the original quartz grains to recrystallize and fuse together.
Uses & applications
Used in construction for road ballast, floor tiles, and countertop surfaces. Also used as a decorative stone in landscaping.
Geological facts
Quartzite is so hard and durable that it often forms the resistant ridges of mountain ranges. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify in the field by its grainy, sugary texture and extreme hardness (it will not be scratched by a knife). Commonly found in folded mountain belts globally.
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