mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Clear/Greyish-Yellow; Luster: Vitreous to waxy (weathered); Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Clear/Greyish-Yellow
- Luster
- Vitreous to waxy (weathered)
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Physical properties
Hardness: 7 (Mohs scale); Color: Clear/Greyish-Yellow; Luster: Vitreous to waxy (weathered); Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed via crystallization from silica-rich magma or precipitation from hydrothermal veins. This specific specimen has been rounded and smoothed by fluvial or coastal erosion processes.
Uses & applications
Commonly used as a decorative aggregate in landscaping, as a source for industrial silica, and tumbled specimens are used in lapidary work and collection.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These rounded smooth 'river stones' can take thousands of years to naturally polish through water action.
Field identification & locations
Identify in the field by its hardness (it can scratch glass) and lack of cleavage. Found globally in riverbeds, beaches, and glacial deposits.
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