Rock Identifier
Sea Glass (Anthropogenic Silicate Glass) — mineral
mineral

Sea Glass

Anthropogenic Silicate Glass

AI-generated identification · may be incorrect

Hardness of 5.5 to 7 on the Mohs scale, vibrant blue color, vitreous to frosted luster, amorphous crystal structure, conchoidal fracture.

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Physical properties

Hardness of 5.5 to 7 on the Mohs scale, vibrant blue color, vitreous to frosted luster, amorphous crystal structure, conchoidal fracture.

Formation & geological history

Formed from discarded human-made glass objects tumbled and weathered by wave action and sand abrasion in marine environments over decades.

Uses & applications

Used primarily in coastal jewelry, decorative mosaics, and by beachcombers and collectors.

Geological facts

Cobalt blue sea glass is relatively rare, often originating from old medicine bottles, poison bottles, or decorative glassware. The frosting effect is caused by millions of microscopic C-shaped pits from sand abrasion.

Field identification & locations

Found along saltwater shorelines and ocean beaches worldwide, highly prized by collectors for its frosted texture and deep coloration.