Minecraft – Can slimes spawn in chunks surrounding slimechunks

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I have recently build a new slimefarm using the coordinates I got from the slimefinder.

The location I am building in has a lot of slime chunks. I have chosen 2 chunks next to each other to build the spawning pads, and used an non-slime chunk in front of them as the collection/lookout are.

I have noticed that slimes are spawning in all 3 chunks, even though slimefinder says it's an empty chunk.

So what is wrong here?

Can slimes spawn outside the borders of the slimechunk.
Do I have my calculations wrong (I highly doubt it)?
Could it have something to do with my world being generated in 1.2.5?

I want to know for sure, because if they do spawn in surrounding chunks, I'm going to half slab down the caves I just lit.

Best Answer

Slimes can only spawn in chunks where they are allowed. Why are there slimes in chunks that shouldn't have them?

Slimes move around. Chances are this is what happens. They will bounce (ooze? slide?) to different chunks over time. This can include falling from higher heights.
You used or read the slime chunk calculator wrong. Maybe you punched in the seed wrong or chose the wrong map. Maybe you misread your map? Double check you if you needed to have a "-" (negative sign) on your coordinates. Double check your calculator.

This may or may not apply to your spawning pads but slimes can spawn at any light level, unlike other mobs like skeletons, zombies, etc.

For reference: Minecraft Wiki - Slime http://www.minecraftwiki.net/wiki/Slime

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Minecraft – Prevent spider spawning in a Mob trap (Minecraft 1.3)

Spiders are spawned in the centre of a block, and because they are larger than a single block, part of them overlaps the other eight blocks surrounding it.

This means that when a spider is placed to be spawned they must not have any solid blocks around them in a 3x3 area in.

An area like this will prevent spiders from spawning.

ooooooooooo
ooooooooooo
ooxooxooxoo
ooooooooooo
ooooooooooo
ooxooxooxoo
ooooooooooo
ooooooooooo
ooxooxooxoo
ooooooooooo
ooooooooooo

o = air
x = solid block (half-slab)

Minecraft – Can slimes spawn in midair

The Mob Spawning section of the Minecraft Wiki goes into some detail about what the requirements are for a mob to spawn. The parts relevant to this question are:

If it's not a squid, then...

the spawning block itself must be non-opaque and non-liquid

the block directly below it must be opaque or upside down slabs / stairs and may not be bedrock

the block directly above it must be non-opaque

the spawning mob must not be obstructed by solid blocks, other mobs or liquids

There are other conditions on Slimes, but those are concerned with them being in the right chunks, rather than the precise blocks. So yes, for every non-squid mob the game tries to spawn, the mob needs to spawn on top of a solid block, with the block they spawn in, and the next one up, being non-opaque non-liquid, and with the block they spawn in being air so they don't fail the collision check. They will not spawn in mid-air.

Recommended practice for spawning slimes is a wide, flat floor, in a chunk they can spawn in, below level 40,

Best Answer

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Minecraft – Prevent spider spawning in a Mob trap (Minecraft 1.3)

Minecraft – Can slimes spawn in midair

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