Cousin in law Bill G wrote:

John, Here are two Samstone locations at Little Cayman Island.  One is on a beach on tiny little (14 acre) Owen Island, 19.6652 degrees North, 80.0640 degrees West.  The other is on a coral reef in 30 feet of water in the Bloody Bay Marine Park, somewhat near 19.685 North, 80.08 West.  I have attached photos of the underwater stone, but Jon Patz (who took these photos) still has the beach stone photo.  I will ask him to send it to me.