mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: tan to milky white, Luster: Vitreous/waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: tan to milky white, Luster: Vitreous/waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins; this specific specimen has been rounded by fluvial (water) erosion or glacial movement.
Uses & applications
Industrial uses include glassmaking and electronics; as a common pebble, it is often used in landscaping or construction aggregate.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These rounded pebbles are often referred to as 'river rocks' and can survive billions of years due to their chemical stability.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till worldwide.
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Epidote
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Nephrite Jade
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic](https://media.rock.id/9ca564b5-bc87-402b-965a-69b21f9aa6bf-thumbnail.jpg)
Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic