Shell grit is coarsely ground or broken seashells. It is used, among other things, by birds as a source of calcium for egg shell production, and to aid digestion.
Other uses include protecting plants from slugs or snails and in aquariums.
They’re sweet like scallops, but harder to overcook, and have no clammy shell grit to purge ... A good rule of thumb is 500g of mussels per eater, as much of the weight is in the shell.
