mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness of 7 on the Mohs scale, white to light pink/translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white to light pink/translucent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the accumulation and natural water-tumbing (weathering and erosion) of quartz crystals or quartz-rich rocks over thousands to millions of years in aquatic or coastal environments.
Uses & applications
Used in landscaping, decorative items, collection, and occasionally lapidary work.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Its high resistance to weathering allows it to survive long transport in rivers and oceans, commonly resulting in smooth pebbles.
Field identification & locations
Easily identified by its high hardness (scratches glass) and conchoidal fracture. Commonly found in riverbeds, lake shores, and beaches worldwide.
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