metamorphic
Quartzite Pebble
Metamorphic Rock (composed mainly of SiO2)
Hardness: 7 on Mohs scale; Color: White to light grey with graininess; Luster: Dull to vitreous; Structure: Granofelsic; Cleavage: None (breaks with conchoidal fracture); Specific Gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- White to light grey with graininess
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: White to light grey with graininess; Luster: Dull to vitreous; Structure: Granofelsic; Cleavage: None (breaks with conchoidal fracture); Specific Gravity: 2.6-2.7.
Formation & geological history
Formed from the metamorphism of quartz sandstone under heat and pressure, typically in orogenic belts. This specific specimen has been rounded and smoothed by water erosion (fluvial or beach action).
Uses & applications
Used in landscaping, construction aggregate, as a source of high-purity silica for glassmaking, and frequently as decorative garden stones.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the caps of ridges and mountains. It is harder than steel and will easily scratch glass.
Field identification & locations
Identified by its granular crystalline appearance (like sugar) and its extreme hardness. Found globally in riverbeds, beaches, and glacial deposits.
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