User blog comment:Omega natsu2/Chapter 370: Demons Reincarnated, Predictions./@comment-42.60.151.15-20140131104028/@comment-42.60.151.15-20140131104515

I'm leaning towards it blowing up being more of a physical action, and then releasing the magic inside it. However, if the lacrima itself is entirely made of magic, then yes, it wouldn't blow up at all.

Now I need someone to remind me how lacrima work...