I suppose it can crack, but would likely take an awful lot to do it. If it's a linen/fabric/canvas type of micarta, I wouldn't worry about it at all. Stuff is extremely rigid and strong. The layers of woven fabric add a lot of reinforcement, and the resin which bonds it together is very tough. I'd bet you're seeing a surface scratch, unless you can actually see a gap to some depth.
Some pics would likely help in giving more definitive advice, though.
David