Can anyone identify this unusual cranesbill?

Just bought this little cranesbill at a local "nursery" - labeled "unusual cranesbill ". Not very informative! But, I like dark leaved plants and this is a ground hugger which suits the place it is intended for. I would love to know more about it and give it a proper label .Apologies not very good piccies. Can anyone help me please?
Jenny namaste

 

Jenny - the closest I could find was Geranium sanguineum, but the leaves are red in autumn.​

 

Could it be a sport that they themselves have found growing in another pot or in the path etc. ?

I think the best place to ask would probably the nursery themselves then they will be able to tell you whether it's a plant which has just lost it's label or something more interesting as the name alludes to.

 

Just googled the cranesbills and up popped "Midnight Blues" so there are a few red leaved ones about - "the low growing with blue flowers appeals" to me and I look forward to its maturity. I will post piccies in due course .Thank you Marley Farley for your help,

 

Been back to Nursery and found out its name. It is "Midnight Reiter" . Easy to accommodate and grow. Will take piccies in due course