sedimentary
Beach Pebbles and Quartz Aggregates
Quartz / Calcite Beach Pebbles (SiO2 / CaCO3)
Hardness: 6-7 on Mohs scale for quartz portions; Luster: Waxy to vitreous, water-worn dull surface; Color: Off-white, yellowish, gray, cream, translucent white; Structure: Microcrystalline/massive pebbles tumbled by wave action; Cleavage: None to indistinct.
- Hardness
- 6-7 on Mohs scale for quartz portions
- Color
- Off-white, yellowish, gray, cream, translucent white
- Luster
- Waxy to vitreous, water-worn dull surface
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Physical properties
Hardness: 6-7 on Mohs scale for quartz portions; Luster: Waxy to vitreous, water-worn dull surface; Color: Off-white, yellowish, gray, cream, translucent white; Structure: Microcrystalline/massive pebbles tumbled by wave action; Cleavage: None to indistinct.
Formation & geological history
Formed through mechanical weathering and erosion by ocean waves and river currents. The pebbles are composed primarily of durable vein quartz, chalcedony, and calcium carbonate fragments, smoothed into rounded shapes over time in coastal environments.
Uses & applications
Mainly collected for hobbyist rock tumbling, beach souvenir collections, aquarium decor, landscape design, and educational identification.
Geological facts
Beach pebbles owe their smooth, rounded shapes to thousands of hours of abrasive grinding in coastal surf zones. Quartz is often the most abundant mineral surviving this intense weathering process due to its resistance to both chemical and physical erosion.
Field identification & locations
Identify by their rounded, water-smoothed contours and beach setting. Found along shorelines, ocean beaches, and riverbanks globally. Great starter specimens for rock tumblers.
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