metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale); Color: tan, cream, or light brown; Luster: dull to vitreous; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.6-2.7. Grainy texture like sandpaper but smooth surface due to water erosion.
- Hardness
- 7 (Mohs scale)
- Color
- tan, cream, or light brown
- Luster
- dull to vitreous
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Physical properties
Hardness: 7 (Mohs scale); Color: tan, cream, or light brown; Luster: dull to vitreous; Crystal structure: Trigonal (microcrystalline); Specific gravity: 2.6-2.7. Grainy texture like sandpaper but smooth surface due to water erosion.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specific specimen has been further shaped and smoothed by water transport in a river or coastal environment.
Uses & applications
Used as decorative landscaping stone, in construction as crushed stone for road beds, and as a durable material for pathways. Polished versions are used in home decor.
Geological facts
Quartzite is so hard and chemically resistant that it often remains as pebbles long after the surrounding softer rocks have eroded away into sand or clay.
Field identification & locations
Identify by its hardness (it will scratch glass) and its sugary, granular appearance when broken. These are common in riverbeds, glacial tills, and beaches worldwide.
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