There you are! Still, better pics and closeup of crystal would help.
It was found on the beachWhat you have is not a mineral or crystal. It is cullet glass.
Cullet glass is old broken bits of glass that are used to create new glass objects. The old glass helps start a new glass melt and saves a lot of the energy that would be needed to create new glass from raw materials. It's a very common material used in most glass manufacturing operations.