mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Milky white to pale grey. Luster: Vitreous to waxy (water-worn). Crystal structure: Trigonal (microcrystalline/massive). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to pale grey
- Luster
- Vitreous to waxy (water-worn)
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Physical properties
Hardness: 7 on Mohs scale. Color: Milky white to pale grey. Luster: Vitreous to waxy (water-worn). Crystal structure: Trigonal (microcrystalline/massive). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
Formation & geological history
Formed through the cooling of silica-rich magma or precipitation from hydrothermal fluids, then exposed, eroded, and rounded by water transport in rivers, streams, or coastal environments.
Uses & applications
Commonly used in landscaping, river rock aggregate, glassmaking, electronics (piezoelectric applications), and as a basic specimen for lapidary tumbling or rock collecting.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Rounded white quartz pebbles are often referred to as 'river stones' or 'milky quartz pebbles'.
Field identification & locations
Identified in the field by its hardness (scratches glass, cannot be scratched by a steel knife), lack of cleavage, milky translucency, and smooth, water-worn exterior. Found abundantly in riverbeds, beaches, and glacial deposits worldwide.
