metamorphic
Quartzite
Quartzite
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Generally white, gray, but can be various colors like pink, red, or green due to impurities. Luster: Vitreous (glassy). Structure: Granular, non-foliated. Cleavage: None.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7 on Mohs scale. Color: Generally white, gray, but can be various colors like pink, red, or green due to impurities. Luster: Vitreous (glassy). Structure: Granular, non-foliated. Cleavage: None.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure, causing the quartz grains to recrystallize and interlock.
Uses & applications
Used in construction as decorative stone, crushed stone for roadbeds, and historically for stone tools.
Geological facts
Because it is so hard and resistant to weathering, quartzite often forms ridges and hilltops in landscapes.
Field identification & locations
Identify by its hardness (scratches glass) and granular texture where the grains break across rather than around them.
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