metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Yellowish-tan to reddish-pink (due to iron oxides); Luster: Vitreous to dull; Crystal structure: Non-foliated, granular; Cleavage: None; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Yellowish-tan to reddish-pink (due to iron oxides)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Yellowish-tan to reddish-pink (due to iron oxides); Luster: Vitreous to dull; Crystal structure: Non-foliated, granular; Cleavage: None; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specimen shows significant rounding and smoothing from river or coastal water erosion.
Uses & applications
Used in construction as crushed stone, in glass manufacturing if pure, and as decorative river stone in landscaping.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, standing as ridges on mountains. It will scratch glass easily, unlike similar-looking limestone.
Field identification & locations
Identify by its extreme hardness and grainy, sugary texture that resembles sandstone but does not rub off. Found globally in ancient mountain belts and riverbeds.
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