Fire Vent (Nether update)

Though it would appear as a normal netherrack block, with a slight visual difference a wary or careful player could notice, when stepped on or triggered by an item, it would produce a flash of fire, lighting the thing that triggered it on fire. Items used to trigger the Fire Vent would be destroyed by the flame. It would have to be mined with a diamond pickax to not destroy it. These blocks would be scattered randomly around the netherrack of the nether so as to be unpredictable. From the side and bottom, this block would look like normal netherrack. Only the top would have a clue, like a larger dark center. They should play a whooshing sound when activated.