metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: Off-white/cream with slight orange iron staining; Luster: Dull to vitreous (waxy); Crystal structure: Granular, interlocking quartz grains; Specific Gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Off-white/cream with slight orange iron staining
- Luster
- Dull to vitreous (waxy)
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Physical properties
Hardness: 7 on Mohs scale; Color: Off-white/cream with slight orange iron staining; Luster: Dull to vitreous (waxy); Crystal structure: Granular, interlocking quartz grains; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building events. This specific specimen has been further shaped into a rounded pebble by water erosion in a river or beach environment.
Uses & applications
Commonly used in construction as crushed stone or road ballast, as a decorative landscape stone, and occasionally in glassmaking if high purity is present.
Geological facts
Quartzite is so tough that it often survives long after the surrounding rocks have eroded away. It is harder than a steel knife and will easily scratch glass.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by steel) and lack of reaction to acid. It often appears sugary or grainy when broken. Commonly found in glaciated areas or riverbeds.
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