Common Blue

Maybe because the site I was using was a UK site for Butterflies...
Seems it's present in Europe also... Lets see if someone confirms the ID.
http://www.butterfly-conservation.org/Bu...

Scientific name should be Polyommatus icarus ?

The only thing is, it says their habitat is more likely to be in Great Brittain, not really the same than Spain or South of France !

I think you're absolutely right. Not very common indeed :)

it coud be a Common Blue... though it doesn't look very 'common'!
http://www.ukbutterflies.co.uk/species.p...