sedimentary
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Variable shades of green, brown, grey, and translucent areas; Luster: Waxy to vitreous (especially when wet); Structure: Microcrystalline; Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Variable shades of green, brown, grey, and translucent areas
- Luster
- Waxy to vitreous (especially when wet)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Variable shades of green, brown, grey, and translucent areas; Luster: Waxy to vitreous (especially when wet); Structure: Microcrystalline; Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed from silica-rich fluid precipitation in volcanic or sedimentary rock cavities, followed by erosion, transport, and natural tumbling by river and ocean wave action along coastal beaches.
Uses & applications
Used for lapidary arts, jewelry (cabochons), tumbling, decorative accents, and rock collecting.
Geological facts
Beach pebbles undergo natural tumbling over hundreds or thousands of years by waves and sand, creating smooth, rounded shapes with polished-like surfaces when wet.
Field identification & locations
Identified by its smooth, water-worn shape, high hardness (scratches glass), translucent to opaque appearance, and occurrence on gravel beaches.
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