metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 (Mohs scale); Color: light grey to white; Luster: vitreous to dull; Crystal structure: granular/interlocking; Cleavage: none; Specific gravity: Approx 2.65.
- Hardness
- 7 (Mohs scale)
- Color
- light grey to white
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: light grey to white; Luster: vitreous to dull; Crystal structure: granular/interlocking; Cleavage: none; Specific gravity: Approx 2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under extreme heat and pressure, typically during mountain-building events. This specific specimen has been further shaped by fluvial or glacial erosion into a smooth pebble.
Uses & applications
Used as a decorative landscape stone, in glassmaking (if high purity), and in construction as a sturdy aggregate or crushed stone.
Geological facts
Quartzite is so tough that it often outlasts other rocks during erosion, remaining as pebbles long after softer surrounding rocks have turned to silt. It is one of the hardest common rocks found at the Earth's surface.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of reaction to acid. Often found in riverbeds, glacial tills, and along coastlines. Collectors look for unique color banding or smooth textures.
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