metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness: 7, Color: Tan, brown, white, Luster: Vitreous to dull, Crystal structure: Massive, Cleavage: None
- Luster
- Vitreous to dull, Crystal structure: Massive, Cleavage: None
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Physical properties
Hardness: 7, Color: Tan, brown, white, Luster: Vitreous to dull, Crystal structure: Massive, Cleavage: None
Formation & geological history
Metamorphism of sandstone, where heat and pressure fuse quartz grains together. Commonly found in riverbeds and glacial till as rounded cobbles.
Uses & applications
Construction, decorative stone, railroad ballast
Geological facts
Because it is so hard, quartzite resists weathering and often forms ridges and hilltops.
Field identification & locations
Identified by its hardness (scratches glass) and sugary texture on fresh breaks. Very common as river rocks.
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