sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Tan, brownish-yellow, semi-translucent. Luster: Vitreous to waxy. Structure: Microcrystalline/Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- Tan, brownish-yellow, semi-translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Tan, brownish-yellow, semi-translucent. Luster: Vitreous to waxy. Structure: Microcrystalline/Trigonal. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.
Formation & geological history
Formed through weathering and erosion of quartz-bearing rocks (like granite or sandstone). Rounded by transport in rivers, streams, or coastal beach action over extended geological periods.
Uses & applications
Commonly used in landscaping, river rock decor, aggregate for concrete, aquarium substrate, and tumbling for amateur lapidary collections.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface. Because of its hardness (7) and chemical stability, quartz pebbles survive long-distance river transport where other minerals wear away.
Field identification & locations
Identified in the field by its hardness (scratches glass), smooth water-worn surface, lack of cleavage, and translucent quality when held to a light source. Found in riverbeds, beaches, and gravel pits worldwide.
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