on the block said block is on. The term "mob" is short for "mobile".1 All mobs can be attacked and hurt (from falling, burning, attacked by player or another mob, falling into the void, etc.) Some of the many monsters that can spawn in the overworld. Water, Glass and all half-blocks are the only place that (hostile) mobs can not spawn. I know that hostile mobs can't spawn with a light level above 7 or on glass or halfsteps, and that peaceful mobs can only spawn with a light level above 8 and on grass, but if there is a block occupied by a permeable object (say a torch, sign, ladder, etc.) Spawn through blocks (mobs don't spawn on them but they can spawn through them, i.e. I think mobs can't spawn on glass and slabs (1/2 blocks), not sure about anything else. A mob is a living, moving game entity. The glass mobs work on a different system to the previous two nightwave mobs (assuming you were around for them). Spiders require a 3x3 area to spawn in. From left to right: Zombie, Spider, Enderman, Creeper, Skeleton, Drowned, Witch, Slime. If you place halfslabs so that you have 2x2 cubes of non-opaque blocks and halfslabs around them, they will not spawn. I was thinking of using pressure plates to do it, or maybe Redstone Dust on some higher areas you can't see. ... Mobs cant spawn on glowstone directly since it is a transparent block, but if there is a solid block next to the glowstone on the same Y level, mobs that need more than 1 block to spawn will still be able to do so. Strange thing to me is I've restarted this map several times, been to the Nether on all of them, and this is the first time I've ever had any Ghasts spawn unexpectedly. But I don't know if that will work. No mobs except for spiders (it seems like as of 1.5.1) can spawn on glass. Mobs can't spawn on the bedrock, in the Nether or the Overworld, so I cheated a bit and put a piece of glass on top of the spawner. I ask because I want to keep an area dark, but I don't want mobs to spawn in it. Proud to be a Dane; We have the worlds oldest monarchy, oldest national flag and were first in the world to legalize porn! ): Signs, Torches (Test are in nether, above bedrock, at highest level, or at least 2 blocks below that coz there's no light in 256) and some of them can drown. Not sure about Wood, Wooden Planks and Solid Metal/Diamond/Wool blocks. 4 years ago. can a mob spawn on specifically that block? If you searching to evaluate In Minecraft Can Mobs Spawn On Glass Blocks And Magic Glass Block Windows price. But if you place glass on the same y axis and 2x2 cubes of non-opaque in them, for some reason, they spawn. I can't remember the exact timeframe, but it's on a clock every 25-ish minutes or so rather than RNG. They spawn on a semi-regular basis.