sedimentary

Sea Glass

Man-made silicate glass

Hardness of 5.5 to 7 on the Mohs scale, frosted or weathered surface texture, various shades of green, brown, or clear.

Identified October 17, 2026More sedimentary →

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Physical properties

Hardness of 5.5 to 7 on the Mohs scale, frosted or weathered surface texture, various shades of green, brown, or clear.

Formed from discarded commercial glass products broken down and tumbled by wave action over decades in marine environments.

Used primarily in jewelry making, mosaic art, and as a popular collectible for beachcombers.

Genuine sea glass requires 20 to 40 years of natural tumbling in the ocean to achieve its characteristic frosted appearance and smooth edges.

Found worldwide along ocean beaches and lake shores near populated coastal areas, identified by its frosted, pitted surface and lack of sharp edges.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)