Black tab shell with brownlip shell combination shell cracking pendant. Black tab shell has a translucent black sheen to it. Other names, black pen shell. It is a fan-shaped shell and are edible just like scallops. Brownlip shell is a specie of sea snails. Also called rock snails. It has dark brown spots in different shapes and forms with light to tan shade. The inside of the shell when cleaned and buffered has a more uniform coloring than the outside face of the shell.