mineral
Chalcedony Pebble
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs. Color: Translucent tan, yellow, or grey. Luster: Waxy to vitreous. Crystal structure: Hexagonal (monoclinic/trigonal at microscopic level). Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Translucent tan, yellow, or grey
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 Mohs. Color: Translucent tan, yellow, or grey. Luster: Waxy to vitreous. Crystal structure: Hexagonal (monoclinic/trigonal at microscopic level). Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed via the deposition of silica from groundwater in cavities of volcanic or sedimentary rocks. This specimen is water-worn, likely from a fluvial or coastal environment.
Uses & applications
Used for lapidary work, jewelry (beads and cabochons), and as an abrasive in some industrial processes.
Geological facts
Chalcedony is an umbrella term for many variety names like agate, jasper, and carnelian. This specific weathered pebble is a common find in riverbeds and beaches worldwide.
Field identification & locations
Identify by its translucency when held to light, waxy feel, and its ability to scratch glass. Commonly found in gravel deposits, beaches, and desert washes.
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