metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Grey, white, translucent; Luster: Vitreous to waxy; Structure: Crystalline/Granoblastic; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Grey, white, translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Grey, white, translucent; Luster: Vitreous to waxy; Structure: Crystalline/Granoblastic; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure. This specimen shows signs of mechanical weathering (rounding) in a river or coastal environment.
Uses & applications
Commonly used in construction as crushed stone, in landscaping, and occasionally as a base for low-cost river rock decor.
Geological facts
Quartzite is so hard that it can scratch glass and steel. It was sometimes used by prehistoric humans to create stone tools when flint was unavailable.
Field identification & locations
Identify by its hardness (will not react to acid like limestone) and grainy, crystalline appearance. Found globally in ancient mountain belts and riverbeds.
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