metamorphic
Quartzite with Hematite staining
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Greyish-green with reddish-brown staining; Luster: Vitreous to waxy; Structure: Granular/crystalline; Cleavage: None; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Greyish-green with reddish-brown staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Greyish-green with reddish-brown staining; Luster: Vitreous to waxy; Structure: Granular/crystalline; Cleavage: None; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. The reddish color is due to iron oxide (hematite) infiltration through micro-fractures over geological time.
Uses & applications
Commonly used as crushed stone in road construction, as ballistic tiles, and occasionally polished as decorative river stones or lapidary material for hobbyists.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, which is why it is frequently found as rounded river cobbles and pebbles like this specimen.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife and its sugary, crystalline texture. Commonly found in riverbeds near mountain ranges containing metamorphic basement rock.
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