metamorphic
Quartzite Pebbles
Metamorphosed sandstone (SiO2)
Hardness: 7 (Mohs scale); Color: White to light grey with translucent patches; Luster: Vitreous to waxy; Texture: Granular but smooth due to water erosion; Specific Gravity: 2.6-2.7.
- Hardness
- 7 (Mohs scale)
- Color
- White to light grey with translucent patches
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to light grey with translucent patches; Luster: Vitreous to waxy; Texture: Granular but smooth due to water erosion; Specific Gravity: 2.6-2.7.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, causing recrystallization of sand grains. This specific specimen has been smoothed by water action in a river or beach environment.
Uses & applications
Used in construction as crushed stone, road ballast, and decoratively in landscaping. High-purity quartzite is used to produce glass and silicon metal.
Geological facts
Quartzite is so hard and chemically resistant that it often forms the tops of ridges and mountains because it resists erosion better than surrounding rocks.
Field identification & locations
Identify by its hardness (it will easily scratch glass) and its lack of reaction to acid. Commonly found in riverbeds, glacial deposits, and mountain ranges globally.
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