metamorphic
Quartzite Pebbler
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Off-white, gray, or tan; Luster: Vitreous to dull; Crystal structure: Non-foliated, granular; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Off-white, gray, or tan
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Off-white, gray, or tan; Luster: Vitreous to dull; Crystal structure: Non-foliated, granular; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure. This specific specimen has been rounded by fluvial or glacial erosion (water/ice transport).
Uses & applications
Used as aggregate in construction, road ballast, decorative landscaping gravel, and historically as a tool stone for making strike-a-lights.
Geological facts
Quartzite is so tough that it often survives intense weathering that breaks down other rocks. It is harder than a steel knife blade and will easily scratch glass.
Field identification & locations
Identify in the field by its sugary texture and extreme hardness (it cannot be scratched by a steel nail). Commonly found in riverbeds, glacial tills, and ancient mountain belts.
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