mineraloid
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
Hardness: 5.5-6.5 (Mohs), Color: Translucent lime green, Luster: Vitreous to etched/frosty, Crystal structure: Amorphous (non-crystalline), Specific gravity: 2.4-2.8
- Hardness
- 5
Identified More mineraloid →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5.5-6.5 (Mohs), Color: Translucent lime green, Luster: Vitreous to etched/frosty, Crystal structure: Amorphous (non-crystalline), Specific gravity: 2.4-2.8
Formation & geological history
Formed from discarded glass products tumbled by waves, currents, and sand over 20-40 years, resulting in chemical weathering and physical abrasion.
Uses & applications
Used in jewelry, mosaic art, home decor, and as a popular beachcomber collectible.
Geological facts
The 'frosty' appearance is caused by the leaching of glass components by salt water, creating tiny pits which scatter light. Rare colors like this lime green often originate from vintage soda bottles or 1950s household glassware.
Field identification & locations
Identify by its frosted surface, lack of sharp edges, and presence of tiny 'C' shaped impact pits. Found on shorelines of oceans, seas, and large lakes.
More like this
Other mineraloid specimens
Amber
Succinite (Organic Mineraloid)
mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Obsidian
Volcanic glass
igneous
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous