mineral
Sea Glass
Silicon dioxide (mostly)
Hardness varies (typically 5.5-7), color is usually clear, frosted, or slightly tinted, luster is dull to frosted, crystal structure is amorphous (non-crystalline), no cleavage, specific gravity similar to glass.
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Physical properties
Hardness varies (typically 5.5-7), color is usually clear, frosted, or slightly tinted, luster is dull to frosted, crystal structure is amorphous (non-crystalline), no cleavage, specific gravity similar to glass.
Formation & geological history
Formed from man-made glass (like bottles or jars) that has been naturally tumbled and weathered by the ocean over many years.
Uses & applications
Used in jewelry making, crafting, and collected for its aesthetic appeal.
Geological facts
Sea glass takes 20 to 40 years, and sometimes as much as 100 to 200 years, to acquire its characteristic texture and shape.
Field identification & locations
Identified by its frosted appearance, smooth edges, and characteristic 'C' shaped marks on the surface called 'c-marks'. Found on beaches worldwide.
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