metamorphic
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: Yellowish-brown to tan; Luster: Vitreous to waxy; Structure: Granular/Crystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 7 (Mohs scale)
- Color
- Yellowish-brown to tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellowish-brown to tan; Luster: Vitreous to waxy; Structure: Granular/Crystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed from quartzose sandstone through metamorphism involving high heat and pressure. This specific specimen shows alluvial rounding, indicating long-term transport in a river or coastal environment.
Uses & applications
Used primarily in construction (crushed stone), decorative landscaping, and as an abrasive. Polished pebbles are used in home decor and aquariums.
Geological facts
Quartzite is so tough that it often survives environmental weathering far longer than the rocks it originally formed around. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife, its grainy 'sugary' texture under magnification, and its characteristic smooth, water-worn surface when found in riverbeds.
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