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{{Infobox structure
| title = Basalt columns
| image = Tall basalt column.png
| imagesize = 200px
| biome = {{BiomeLink|Basalt Deltas}}
| blocks =
* {{BlockLink|Basalt}}
| canspawn = No
}}
'''Basalt columns''' are vertical clusters of [[Minecraft:basalt]] blocks found within [[Minecraft:basalt delta]] biomes. They may also contain lava and magma in the many gaps between the towers.

== Generation ==
[[File:Basalt columns with many variations.png|thumb|An example of basalt columns in the air and on the ground.]]Basalt columns generate as part of the ''surface structure generation'' in the [[Minecraft:Basalt Deltas]] biome. They appear in two variations: '''small basalt columns''' and '''large basalt columns'''. These formations are placed during the ''Surface Structures'' decoration step and contribute to the biome's rugged, volcanic terrain.

The game defines their generation using the following features:

* '''Small Basalt Columns''' – Controlled by <code>NetherPlacements.SMALL_BASALT_COLUMNS</code>
* '''Large Basalt Columns''' – Controlled by <code>NetherPlacements.LARGE_BASALT_COLUMNS</code>

Basalt columns are defined as ''Placed Features'', which determine their spawning frequency and location. The generation process follows these steps:

# ''Configured Features'':
#* The game references pre-defined basalt column structures from <code>NetherFeatures.SMALL_BASALT_COLUMNS</code> and <code>NetherFeatures.LARGE_BASALT_COLUMNS</code>.
#* These features define the ''basic shape and formation'' of the columns.
# ''Placement Registration'' (<code>NetherPlacements.bootstrap()</code>):
#* The basalt column features are registered with specific placement rules:
#** Small Basalt Columns spawn 4 times per chunk (<code>CountOnEveryLayerPlacement.of(4)</code>).
#** Large Basalt Columns spawn 2 times per chunk (<code>CountOnEveryLayerPlacement.of(2)</code>).
#* The placement occurs using the <code>BiomeFilter.biome()</code> rule, ensuring they only appear in the Basalt Deltas biome.
# ''World Generation Step'' (<code>GenerationStep.Decoration.SURFACE_STRUCTURES</code>):
#* During terrain decoration, the game places basalt columns in randomized locations.
#* Their height, clustering, and spread are determined by internal ''noise functions'' and world height layers.

==== Interaction with other features ====

* Basalt columns often generate alongside ''Basalt Blobs'' (<code>NetherPlacements.BASALT_BLOBS</code>), which contribute to the rugged terrain.
* The presence of ''Blackstone Blobs'' (<code>NetherPlacements.BLACKSTONE_BLOBS</code>) adds variation to the biome’s rocky surface.

== Data values ==

=== ID ===

{{el|je}}:
{{ID table
|firstcolumnname=Feature type
|displayname=[No displayed name]
|spritename=basalt-columns
|spritetype=env
|nameid=basalt_columns
|foot=1}}

{{ID table
|firstcolumnname=Configured feature
|displayname=[No displayed name]
|spritename=basalt-columns
|spritetype=env
|nameid=large_basalt_columns
}}
{{ID table
|displayname=[No displayed name]
|spritename=basalt-columns
|spritetype=env
|nameid=small_basalt_columns
|foot=1}}

{{el|be}}:
{{ID table
|firstcolumnname=Feature
|displayname=[No displayed name]
|spritename=basalt-columns
|spritetype=env
|nameid=basalt_columns_feature
|foot=1}}

=== Config ===

{{main|Configured feature}}
{{el|java}}:
<section begin="config"/><div class="treeview">
* {{nbt|compound|config}}
** {{nbt|int}}{{nbt|compound|reach}}{{until|JE 26.3}} / {{nbt|compound|column_reach}}{{upcoming|JE 26.3}} The max radius of a column in this column cluster. Value between 0 and 3 (inclusive).
** {{nbt|int}}{{nbt|compound|column_count}}{{upcoming|JE 26.3}} The number of columns to generate. Value between 1 and 150 (inclusive).
*** {{nbt inherit/int_provider}}
** {{nbt|int}}{{nbt|compound|height}} The max height is <code>height + 1</code>. Value between 1 and 10 (inclusive).
** {{nbt|int}}{{nbt|compound|cluster_reach}}{{upcoming|JE 26.3}} The size of the square to attempt to generate columns in. Value between 0 and 13 (inclusive) which is also limited by {{cd|height}}.
** {{nbt|string|block}}{{upcoming|JE 26.3}} Which block to place.
** {{nbt|string|can_replace}}{{upcoming|JE 26.3}} Which blocks can be replaced by the column.
** {{nbt|string|continue_through}}{{upcoming|JE 26.3}} Which pre-existing blocks to accept as part of a column.
**{{nbt|string|cannot_place_on}}{{upcoming|JE 26.3}} Which blocks are avoided when starting placement.
*** {{nbt inherit/int_provider}}
</div><section end="config"/>

{{Collapse|title=An example|head=1}}
<syntaxhighlight lang="json">
{
"type": "minecraft:basalt_columns",
"config": {
"height": {
"type": "minecraft:uniform",
"value": {
"max_inclusive": 4,
"min_inclusive": 1
}
},
"reach": 1
}
}
</syntaxhighlight>
{{Collapse|tail=1}}

== History ==
=== ''Java Edition'' ===
{{HistoryTable
|{{HistoryLine|java}}
|{{HistoryLine||1.16|dev=20w15a|Added basalt columns.}}
}}

=== ''Bedrock Edition'' ===
{{HistoryTable
|{{HistoryLine|bedrock}}
|{{HistoryLine||1.16.0|dev=beta 1.16.0.57|Added basalt columns.}}
}}

== Issues ==
{{issue list}}

== Trivia ==
*In real life, {{w|columnar jointing}} is the phenomenon that causes rocks to form arrays of columns. Other rocks featured in ''Minecraft'' that can be subject to columnar jointing include [[Minecraft:andesite]], [[Minecraft:tuff]], and [[Minecraft:Nether quartz|quartz]].

== Gallery ==
=== Screenshots ===
<gallery>
File:Lava sea columns.png|Basalt columns in a lava sea.
File:Floating column.png|These basalt columns generated on a floating [[Minecraft:blackstone]] island.
</gallery>

== Navigation ==
{{Navbox generated features}}

[[Minecraft:es:Columnas de basalto]]
[[Minecraft:fr:Colonnes de basalte]]
[[Minecraft:ja:玄武岩の柱の塊]]
[[Minecraft:lzh:黑堦石峰林]]
[[Minecraft:pt:Colunas de basalto]]
[[Minecraft:zh:玄武岩石柱林]]

Minecraft:Basalt Columns - Revision history

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