metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness: 7, Color: reddish-brown due to iron oxide staining, grayish, Luster: Vitreous to greasy, Crystal structure: Massive, granular, Cleavage: None, Specific gravity: 2.6-2.7
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Physical properties
Hardness: 7, Color: reddish-brown due to iron oxide staining, grayish, Luster: Vitreous to greasy, Crystal structure: Massive, granular, Cleavage: None, Specific gravity: 2.6-2.7
Formation & geological history
Formed by metamorphism of sandstone, usually under tectonic pressure and heat.
Uses & applications
Used in construction, as decorative stone, and sometimes as railway ballast. Also collected by rockhounds.
Geological facts
Quartzite is very resistant to weathering, which is why it often forms ridges or peaks in mountainous areas.
Field identification & locations
Identify by its hardness (scratches glass) and granular, sugary texture. Common in areas with a history of mountain building.
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