mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Pale tan to light brownish grey. Luster: Vitreous to dull/waxy when weathered. Crystal structure: Trigonal/Hexagonal. Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Pale tan to light brownish grey
- Luster
- Vitreous to dull/waxy when weathered
Identified More mineral →
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Physical properties
Hardness: 7 on Mohs scale. Color: Pale tan to light brownish grey. Luster: Vitreous to dull/waxy when weathered. Crystal structure: Trigonal/Hexagonal. Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary rock environments, then weathered, eroded, and rounded by stream or water action into a smooth pebble.
Uses & applications
Commonly used in landscaping, construction aggregates, decorative gravel, and as a popular basic specimen for rock collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Rounded stream pebbles like this one can travel hundreds of miles from their original source outcrop.
Field identification & locations
Identified by its scratch resistance (scratches glass readily), rounded water-worn shape, and absence of distinct cleavage planes. Extremely common worldwide in riverbeds, beaches, and glacial deposits.
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Mineral