mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: White to greyish-white, Luster: Vitreous to dull (weathered), Structure: Hexagonal/Trigonal, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: White to greyish-white, Luster: Vitreous to dull (weathered), Structure: Hexagonal/Trigonal, Specific Gravity: 2.65
Formation & geological history
Formed from the cooling of silica-rich magma or precipitation from hydrothermal fluids. This specific specimen is water-worn, indicating erosion and transport by a river or coastline over thousands of years.
Uses & applications
Used in construction aggregate, landscaping, glassmaking, electronics, and as a common collectible for beach/river rock enthusiasts.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its durability and resistance to chemical weathering allow it to survive long transport distances in rivers.
Field identification & locations
Identified by its hardness (cannot be scratched by a steel knife) and its lack of cleavage. It is an extremely common find in riverbeds and on beaches worldwide.
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