An Argus prowling through a crystal laden area.

During games I guess we'll mostly count it as a 'regular' forest.
The crystals are genuine though it beats me what specific type they are. I once noticed them at a fair, thought 'hey, those should make for a nice gaming terrain piece' and bought them for a few bucks (still way cheaper than any 'official' terrain offered by the gaming companies).

I put the Argus for size comparison there, nothing else (and he is copyright Privateer Press, of course)