metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Grayish-white to tan; Luster: Vitreous to waxy; Structure: Granular/Crystalline; No cleavage; Specific gravity: approx. 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Grayish-white to tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Grayish-white to tan; Luster: Vitreous to waxy; Structure: Granular/Crystalline; No cleavage; Specific gravity: approx. 2.65.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, often during mountain-building events. This specimen has been rounded into a pebble via water erosion in a river or beach environment.
Uses & applications
Used in construction as crushed stone, in glass manufacturing if pure enough, and decorative landscaping. High-quality pieces are used as gems/cabochons.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the caps of ridges and mountains because it resists weathering better than surrounding rocks.
Field identification & locations
Identify by its ability to scratch glass and its grainy, sugary texture visible under a lens. Common in ancient riverbeds and glaciated regions globally.
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