Diamond Dust

The Diamond Dust is a mob found when mining Diamonds in Mushroom Biomes.

Behaviour
Diamond Dusts can only be found in Diamond Ores in Mushroom Biomes, and only a 1 out of 50 chance one will spawn. If you find one from a Diamond Ore, it will stay immobile for about 10 seconds before attacking.

Combat
It can climb any walls like a Spider except Soul Sand, so try to build a 1 X 1 X 3 Soul Sand tower when you see one, then keep on hitting it with whatever you have.

If you find one underwater, you can simply drown it, however, it will take very long to drown one because it has a lot of HP.

You can also simply lure it into lava, but that will totaly destroy the Diamond, so it is not recommended.

If you suspect one of the Diamond Ore has a Diamond Dust inside, you can blow it up with TNT or a Creeper, and the mob will spawn with only 50 HP (however doing so will make it attack you immidieatly).