metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness 7 on Mohs scale. Color ranges from white to pinkish, reddish, or gray depending on impurities (iron oxide causes pink/red). Vitreous to dull luster. Granular, interlocking quartz crystal structure.
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Physical properties
Hardness 7 on Mohs scale. Color ranges from white to pinkish, reddish, or gray depending on impurities (iron oxide causes pink/red). Vitreous to dull luster. Granular, interlocking quartz crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. High heat and pressure cause the quartz grains to recrystallize and fuse together.
Uses & applications
Used as decorative stone, crushed stone for road construction, railway ballast, and in the production of silica for glass and industrial uses.
Geological facts
Quartzite is extremely hard and resistant to weathering, often forming ridges and prominent landscape features.
Field identification & locations
Identified by its sugary, granular texture and extreme hardness (will scratch glass). Often found as river-tumbled stones or cobbles due to its durability. Common worldwide in areas of regional metamorphism.
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