mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Light greyish-white, translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Fracture: Conchoidal; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Light greyish-white, translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Light greyish-white, translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Fracture: Conchoidal; Specific gravity: 2.65
Formation & geological history
Formed through weathering and erosion of quartz-bearing rocks like granite or quartzite, subsequently rounded by stream or wave action over long periods.
Uses & applications
Commonly used as decorative gravel, in landscaping, and as a low-cost specimen for educational or rock-tumbling purposes.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface. Rounded quartz pebbles like this one have often traveled miles in rivers or oceans to acquire their smooth, stream-worn texture.
Field identification & locations
Identified by its harness (scratches glass readily), smooth rounded shape from erosion, lack of cleavage, and translucent grey-white appearance. Widely found along riverbeds, beaches, and glacial till worldwide.
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