metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white to light gray; Luster: vitreous to dull; Structure: non-foliated, granular; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- white to light gray
- Luster
- vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white to light gray; Luster: vitreous to dull; Structure: non-foliated, granular; Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during tectonic plate collisions. Often found as rounded pebbles due to water erosion in riverbeds or on beaches.
Uses & applications
Commonly used as construction aggregate, decorative landscaping stone, and in glassmaking if highly pure. Tumbled pieces are used in craft jewelry.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks as they weather away. It is harder than steel and will easily scratch glass.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel blade) and its grainy, crystalline appearance. It is ubiquitous in glaciated regions and river deposits worldwide.
