There's a similar rock thats found on the east coast of Scotland. It known as Dunbar Marble. Unfortunately most of it ends up in the kilns of the cement works. Looks great polished like yours Jeanette. Thanks for the pics.
Couldn't find a link to the polished specimens, but here's one to the location.
http://www.barnsness.ukfossils.co.uk...ion-photos.htm
Bill