Elemental Mining Rocks

[bluewolf]

Is it normal for an Elemental mining rock to explode into nothing? It's happened to me twice, just wondered if it's a bug or not.

That place where you can walk by a rock and it explodes into a random elemental is where I'm referring to.

[crannog]

Yes is normal.

If you touch Ctrl Shift, you will see the difference between a regular rock and the ones that will explode.