metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Hardness: 7 on Mohs scale. Color: Tan, yellowish-white, or buff. Luster: Vitreous to waxy. Crystal structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Tan, yellowish-white, or buff
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Tan, yellowish-white, or buff. Luster: Vitreous to waxy. Crystal structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.7.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, where individual quartz grains recrystallize into a locked mosaic structure. This specific specimen has been further shaped and rounded by aqueous erosion in a river or stream bed.
Uses & applications
Used in construction as crushed stone, in glass manufacturing if highly pure, as a decorative landscape stone, and occasionally in jewelry as tumbled stones.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock layers, leading to the formation of ridges and hilltops. It is one of the most chemically resistant rocks on the Earth's surface.
Field identification & locations
Identify in the field by its hardness (it will easily scratch glass) and its sugary, granular texture that looks like sparks on a broken surface. It is found globally in mountainous regions and riverbeds.
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