Underwater Magma

Underwater Magma
Biomes	Any Overworld biomes
Generates in; existing chunks	No
Consists of	Magma block;

Underwater magma is a feature found underwater in the Overworld.

Generation

An underwater magma is a feature made entirely of magma blocks. It is up to 3×3×3 in size. It can be found at the underwater floor in any Overworld biome.

Data values

ID

Java Edition:

Feature type	Identifier
[No displayed name]	`underwater_magma`

Configured feature	Identifier
[No displayed name]	`underwater_magma`

Bedrock Edition:

Feature	Identifier
[No displayed name]	`underwater_magma_feature`

which is used in:

Feature	Identifier
[No displayed name]	`underwater_magma_snap_to_surface_feature`

which is used in:

Feature	Identifier
[No displayed name]	`underwater_magma_underground_feature`

Config

Java Edition:

[NBT Compound / JSON Object] config
- [Int] floor_search_range Value between 0 and 512 (inclusive).
- [Int] placement_radius_around_floor Value between 0 and 64 (inclusive).
- [Float] placement_probability_per_valid_position Value between 0.0 and 1.0 (inclusive).

An example

{
  "type": "minecraft:underwater_magma",
  "config": {
    "floor_search_range": 5,
    "placement_probability_per_valid_position": 0.5,
    "placement_radius_around_floor": 1
  }
}

History

Java Edition

Java Edition
1.17	21w06a	Added underwater magma, which generates at the bottom of underground bodies of water.
1.18	experimental snapshot 6	Underwater magmas more frequently generate in underwater caves.
1.18	21w40a	The frequency of underwater magma generation has been slightly increased.

Bedrock Edition

Bedrock Edition
1.18.0			beta 1.18.0.22				Added underwater magma.^[1]

Issues

Issues relating to "Underwater Magma" are maintained on the bug tracker. Issues should be reported and viewed there.

Gallery

Two patches of underwater magma in a flooded cave.

References

↑ MCPE-141376 – [Experimental] Magma blocks doesn't generate at the bottom of the underwater cave – resolved as "Fixed".

[1] MCPE-141376 – [Experimental] Magma blocks doesn't generate at the bottom of the underwater cave – resolved as "Fixed".

[1]