sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Tan, beige, translucent brownish-yellow with darker mineral inclusions. Luster: Vitreous to waxy. Cleavage: None. Fracture: Conchoidal. Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Tan, beige, translucent brownish-yellow with darker mineral inclusions. Luster: Vitreous to waxy. Cleavage: None. Fracture: Conchoidal. Specific gravity: 2.65.
Formation & geological history
Formed through weathering, erosion, and transport by water of quartz-rich rocks, leading to a rounded, smooth pebble shape over time.
Uses & applications
Commonly used as gravel, landscape decoration, river rock ballast, and for mineral collection or tumbling.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Small rounded pebbles like this are formed by river or ocean water polishing over long periods.
Field identification & locations
Identified by its hardness (scratches glass), waxy to vitreous luster, smooth rounded pebble form, and lack of cleavage. Very common in riverbeds, beaches, and gravel pits globally.
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