mineral
Beach Agate (Chalcedony)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: Translucent tan, honey, or ‘carnelian’ orange; Luster: Waxy to vitreous; Crystal structure: Microcrystalline (trigonal); Cleavage: Fractures conchoidally; Specific gravity: 2.6-2.64.
- Hardness
- 6
- Color
- Translucent tan, honey, or ‘carnelian’ orange
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Translucent tan, honey, or ‘carnelian’ orange; Luster: Waxy to vitreous; Crystal structure: Microcrystalline (trigonal); Cleavage: Fractures conchoidally; Specific gravity: 2.6-2.64.
Formation & geological history
Formed as a secondary deposit when silica-rich groundwater fills cavities (vesicles) in volcanic or sedimentary rocks. This specimen has been naturally tumbled and polished by wave action over thousands of years.
Uses & applications
Used in gemstone carving, jewelry (cabochons), and as decorative aquarium or landscaping stones. High-grade specimens are popular among lapidary artists.
Geological facts
Agate is a variety of chalcedony characterized by its translucency and fine grain. Beach agates are often called 'sea glass of the earth' because the ocean naturally smooths their rough edges into rounded pebbles.
Field identification & locations
Identify in the field by its translucency (hold it up to sunlight to see if it glows) and smooth, waxy texture compared to surrounding rocks. Commonly found on Pacific Northwest beaches (USA) and along the shores of the Great Lakes.
