ToME: the Tales of Maj'Eyal

I'm in Rhaloren camp. It looks like a glimmerstone, auto-explore stops for it, it doesn't seem to daze me & mousing over it doesn't say what it is (not even floor, just blank).

Edit: Found another one & this one did daze me, I must just have too high saves to consistantly set them off. They could still use a label.