sedimentary
Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, waxy to vitreous luster, white/translucent quartz combined with a finer-grained dark grey matrix, conchoidal fracture, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to vitreous luster, white/translucent quartz combined with a finer-grained dark grey matrix, conchoidal fracture, specific gravity around 2.65.
Formation & geological history
Formed through intense weathering, transportation, and aqueous tumbling of quartz veins or parent rock, smoothing into a rounded pebble in a riverbed or coastal environment.
Uses & applications
Used as a decorative garden stone, in landscaping, aquarium decoration, or as a pocket specimen for rock collectors.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is exceptionally resistant to weathering, which is why it often survives as smooth pebbles long after other minerals have eroded away.
Field identification & locations
Commonly found in riverbeds, beaches, and alluvial gravel deposits worldwide, including the river systems of Taiwan.
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