metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: tan to light yellowish-green, Luster: dull to vitreous when wet, Structure: microcrystalline quartz, no cleavage, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: tan to light yellowish-green, Luster: dull to vitreous when wet, Structure: microcrystalline quartz, no cleavage, Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under extreme heat and pressure, often during mountain-building events. This specimen has been rounded by fluvial (river) or glacial erosion.
Uses & applications
Used primarily as construction aggregate, road ballast, and decorative landscaping stones. Highly durable for outdoor use.
Geological facts
Quartzite is so tough that it often outlasts the surrounding mountains, remaining as rounded pebbles in riverbeds millions of years after the original formation has eroded.
Field identification & locations
Identify by its hardness (it will easily scratch glass) and lack of visible grains compared to sandstone. Commonly found in riverbeds, glacial tills, and ancient beach deposits.
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