These deposits seem to form on shells but I don’t know why. Nor what they are. They look like icing. I used to call it frosting. Icing, frosting, it doesn’t matter. It’s pretty, and just one more mystery.
There’s so much I don’t know about these treasures of the sea. There’s so much to learn about treasures. And the sea. So where would I look up “icing on shells?”