Description
A “black tab shell” refers to a type of seashell that has a dark, almost black, color with a subtle sheen. These shells are typically a fan-shaped type of shell, also known as a pen shell, and have a translucent sheen. They are often found in areas where the sand or mud has low oxygen levels, which allows iron in the shell to combine with sulfur to form iron sulfide, creating a dark stain.
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