sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or light pinkish-brown in color, vitreous to greasy luster, hexagonal crystal system when un-worn, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or light pinkish-brown in color, vitreous to greasy luster, hexagonal crystal system when un-worn, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through mechanical weathering and aqueous transport of primary quartz veins or pegmatites, often found in stream beds and beaches over millions of years.
Uses & applications
Used in landscaping, decorative stone, historical stone tools, and as aggregate in construction.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to both chemical and mechanical weathering, which is why it commonly survives as smooth pebbles.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape found in riverbeds and coastal gravels.
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