mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Creamy white to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Creamy white to translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Creamy white to translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed from molten magma as it cools or through hydrothermal activity. This specimen appears water-worn, indicating it was shaped by alluvial or fluvial processes in a river or creek bed.
Uses & applications
Quartz is used in glassmaking, abrasives, electronics (due to piezoelectric properties), and as a gemstone or decorative aggregate in construction.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why small pebbles like this are so common globally.
Field identification & locations
Identify in the field by its ability to scratch glass and its lack of cleavage. Often found in gravel pits, riverbeds, and beaches across the world.
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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