metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white to off-white/beige; Luster: dull to vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific gravity: approx. 2.65
- Hardness
- 7 on Mohs scale
- Color
- white to off-white/beige
- Luster
- dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: white to off-white/beige; Luster: dull to vitreous; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific gravity: approx. 2.65
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure, where quartz grains recrystallize into a dense network. This specific rounded shape occurred through fluvial or marine erosion (water tumbling over time).
Uses & applications
Commonly used in landscaping, as an abrasive, in construction as crushed stone, and occasionally in decorative displays or as smooth 'worry stones'.
Geological facts
Quartzite is so durable that it often survives the intense weathering processes that destroy other rocks, leaving behind these smooth pebbles in riverbeds and on beaches. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify in the field by its high hardness (cannot be scratched by a steel knife) and its grainy but fused texture. Commonly found in riverbeds, glacial deposits, and along coastlines.
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