metamorphic
Quartzite Pebble
Metamorphic Rock (rich in SiO2)
Hardness: 7 on Mohs scale; Color: Tan to off-white; Luster: Dull to waxy; Structure: Granular/crystalline; Cleavage: None/conchoidal fracture; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Tan to off-white
- Luster
- Dull to waxy
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan to off-white; Luster: Dull to waxy; Structure: Granular/crystalline; Cleavage: None/conchoidal fracture; Specific gravity: 2.6-2.7
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure, causing recrystallization. This specific specimen has been further shaped by water erosion or river transport.
Uses & applications
Used widely in construction as crushed stone or gravel; polished versions are used for decorative landscaping and as 'river rocks' in interior design.
Geological facts
Quartzite is so tough that it often survives the erosion that destroys the mountains it came from. It is harder than most of the minerals that surround it in the ground.
Field identification & locations
Identify by its ability to scratch glass and its grainy, sugary surface texture. Common in riverbeds and glacial deposits globally.
