Yet, in "Heart of Stone" we can clearly see a Female Changeling, changed into a piece of rock, that survives many direct phaser blasts. What am I missing? These seems to deny each other.
I assume, that the fact, that Odo exploded (in "Crossover"), after being hit by phaser fire, in mirror universe only has nothing to here. I also assume, that Odo (in "Heart of Stone") set his phaser to "something more than just stun", when he was trying to destroy, what he thought, was a piece of rock.