metamorphic
Quartzite Pebble (or Chert)
Quartzite (primarily SiO2)
AI-generated identification · may be incorrectHardness 7 on the Mohs scale, vitreous to dull luster, cryptocrystalline to granular texture, conchoidal to uneven fracture.
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Physical properties
Hardness 7 on the Mohs scale, vitreous to dull luster, cryptocrystalline to granular texture, conchoidal to uneven fracture.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure, then smoothed by fluvial or alluvial erosion.
Uses & applications
Commonly used in construction aggregate, landscaping, road metal, and historical stone tool making.
Geological facts
Quartzite is so resistant to chemical and physical weathering that it often forms the tops of ridges and resistant gravel deposits.
Field identification & locations
Identify by its ability to scratch glass easily, lack of reaction to acid, and smoothly rounded water-worn surface found in riverbeds.
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