sedimentary
Beach Pebble (Quartz / Quartzite)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: White, cream, tan, grey, yellow. Luster: Dull to vitreous. Structure: Microcrystalline or granular. Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- White, cream, tan, grey, yellow
- Luster
- Dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale. Color: White, cream, tan, grey, yellow. Luster: Dull to vitreous. Structure: Microcrystalline or granular. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the erosion, mechanical weathering, and long-term water-abrasion of quartz-rich igneous, metamorphic, or sedimentary rocks along coastal shorelines and rivers.
Uses & applications
Used in landscaping, aquarium decor, construction aggregate, decorative stone paths, and beachcombing collections.
Geological facts
Beach pebbles undergo millions of smooth-tumble cycles from ocean wave action, naturally rounding their edges over long periods of geological time.
Field identification & locations
Identify by rounded, water-worn smooth surfaces and high hardness (scratches glass). Very common along sea beaches, lake shores, and riverbeds worldwide.
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