Avalan: This may be obvious, but if it is indeed breakable, did you try Aard?
Smrtak25: Aard, Igni even sword and fists :D :D :D
I figured as much, but I thought I'd mention it. I forgot all about Aard a couple of times in The Witcher 2, even having to look it up at one point when I got stuck on what to do next, which was a little humiliating :o)
From the picture... *squints*... Yeah, I have no idea what that thing is :oD Sorry I can't be of any help..
Edit: I know it's sad, but I just made myself laugh. As a joke, I was going to suggest you try yelling at it, but considering this is a fantasy RPG, that might actually work :o)