This is a sad and solitary little stone situated in a farmers field on your right hand side, between the road and the seashore, travelling south on the A77 about 1km past the seaweed(alginates) factory.
As it is quite small it may, or may not, be of human design.
The Witching Stone was pointed out to me by an elderly relative on the occassion of scattering the ashes of my mother in law over her favourite childhood beach.
He told me that as children playing nearby they would always take a wide berth to avoid this stone as it had a sinister and frightening aspect.
I can find no listing of this stone in my OS disc nor of the name of the adjoing beach known by him as Curragh Beach, therefore the OS location given is only a questimate.
The stone is easy to see alongside the A77 but parking anywhere near is impossible. The stone stands in the middle of a recently ploughed field. It is approximately 1m high x 0.5m wide at the base. It has a pointy top.
The stone must be a considerable pain for the person who has to plough the field :)