sedimentary
Sea Glass (Frosted Glass Fragment)
Amorphous Silica (Anthropogenic Sediment)
Hardness: 5.5-7 (Mohs); Color: Seafoam green; Luster: Frosted/Vitreous; Structure: Amorphous; Texture: Pitted and smoothed surface.
- Hardness
- 5
- Color
- Seafoam green
- Luster
- Frosted/Vitreous
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Physical properties
Hardness: 5.5-7 (Mohs); Color: Seafoam green; Luster: Frosted/Vitreous; Structure: Amorphous; Texture: Pitted and smoothed surface.
Formation & geological history
Formed from discarded glass bottles or jars that have been tumbled and chemically weathered by ocean waves and sand over a period of 20 to 50 years.
Uses & applications
Used primarily in jewelry making, coastal decor, and as a popular beachcomber's collectible.
Geological facts
True sea glass is becoming rarer due to the increased use of plastic bottles. The 'frosted' look is caused by the leaching of internal alkalis from the glass through hydration by salt water.
Field identification & locations
Identify by its uniform 'frosting' and lack of sharp edges. Common on shorelines with history of shipping or coastal dumping. Look for 'C' shaped pits on the surface.
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