Shiny little thing

I was lying on my back on a wooden bench yesterday afternoon, and something heavy landed on my Chin. It started moving right away and I instinctively brushed it off and felt huge wings. That made me jump and I thought I was about to get stung by a wasp, but I was pleasantly surprised to look at the grass and see there was a huge queen scurrying along the floor.

Look at how big it is. I think it could be a Camponotus arboreus queen. It is 20mm long, and its head is amazingly huge. It also has a silver metallic shine on the sides of its gaster. One of the most beautiful queens I have come across.