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{{Infobox version
|title=Minecraft 21w07a
|image=21w07a.jpg
|image2=Java Edition 21w07a.png
|edition=Java
|type=Snapshot
|date=February 17, 2021
|clienthash=e6886725265257d34b5e0d0661632c61800bded3
|jsonhash=408f6ae49e28f2cabbef3dc91898a53bf4414180
|serverhash=99c3a9744719d0d401af63bb684cf1eb5231a75c
|clientmap=bdcb712a65f1664ea4b2f28b2e88418817ead0d7
|servermap=66ebacdeccfdf8f6439f7a90234fc76e8ef5c5a6
|parent=1.17
|prevparent=1.16.5
|prev=21w06a
|next=21w08a
|nextparent=1.17.1
}}<onlyinclude>

'''21w07a''' is the tenth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]], released on February 17, 2021,<ref>{{snap|21w07a|February 17, 2021}}</ref> which adds [[Minecraft:Deepslate|grimstone]] and tweaks ore and cave generation.

== Additions ==
=== Blocks ===
'''[[File:Deepslate JE1.png|32px]] [[Minecraft:Grimstone]]'''
* A new type of [[Minecraft:stone]].
* Generates below Y=0.
** Has a gradual transition from stone to grimstone starting from Y-level -1 until it reaches -8.
** Takes over fully underground starting from Y=-8.
* Functions identical to [[Minecraft:cobblestone]] and [[Minecraft:blackstone]] in that grimstone can be used to craft basic tools, furnaces and brewing stands.
* Can be used as a decorative block.
** It can be crafted into many different variants. [[Minecraft:Chiseled grimstone]], [[Minecraft:polished grimstone]], [[Minecraft:grimstone bricks]], [[Minecraft:grimstone tiles]].
* Has a hardness value greater than that of [[Minecraft:stone]] but can be mined with any [[Minecraft:pickaxe]].
* Can't be insta-mined unlike stone.

'''{{Animate|Cobbled Deepslate Stairs JE1.png; Cobbled Deepslate Slab JE1.png; Cobbled Deepslate Wall (ewU) JE1.png|32px}} [[Minecraft:Cobbled Deepslate Stairs|Grimstone Stairs]], [[Minecraft:Cobbled Deepslate Slab|Slabs]] and [[Minecraft:Cobbled Deepslate Wall|Walls]]'''
* Added grimstone stairs, slabs and walls.

'''{{Animate|Polished Deepslate Stairs JE1.png; Polished Deepslate Slab JE1.png; Polished Deepslate Wall (ewU) JE1.png|32px}} [[Minecraft:Polished Deepslate Stairs|Polished Grimstone Stairs]], [[Minecraft:Polished Deepslate Slab|Slabs]] and [[Minecraft:Polished Deepslate Wall|Walls]]'''
* Added polished grimstone stairs, slabs and walls.

'''{{Animate|Deepslate Tile Stairs JE1.png; Deepslate Tile Slab JE1.png; Deepslate Tile Wall (ewU) JE1.png|32px}} [[Minecraft:Deepslate Tile Stairs|Grimstone Tile Stairs]], [[Minecraft:Deepslate Tile Slab|Slabs]] and [[Minecraft:Deepslate Tile Wall|Walls]]'''
* Added grimstone tile stairs, slabs and walls.

'''{{Animate|Deepslate Brick Stairs JE1.png; Deepslate Brick Slab JE1.png; Deepslate Brick Wall (ewU) JE1.png|32px}} [[Minecraft:Deepslate Brick Stairs|Grimstone Brick Stairs]], [[Minecraft:Deepslate Brick Slab|Slabs]] and [[Minecraft:Deepslate Brick Wall|Walls]]'''
* Added grimstone brick stairs, slabs and walls.

=== General ===
'''[[Minecraft:Data pack]]s'''
* Added {{Nbt|boolean|grimstone_enabled}} to <code>worldgen/noise_settings/*.json</code>.

== Changes ==
=== Blocks ===
'''[[Minecraft:Big dripleaf]]'''
* Slightly changed model.

[[File:21w07a Texture comparison.jpg|thumb|A comparison of the old and new ore textures.]]
'''[[Minecraft:Blackstone]], [[Minecraft:polished blackstone bricks]], and [[Minecraft:cracked polished blackstone bricks]] and [[Minecraft:stair]], [[Minecraft:slab]] and [[Minecraft:wall]] variants'''
* Slightly changed the texture.

'''[[Minecraft:Glow lichen]]'''
* Can now naturally generate on grimstone.

'''[[Minecraft:Ore]]s'''
* The textures of [[Minecraft:coal ore]], [[Minecraft:diamond ore]], [[Minecraft:gold ore]], [[Minecraft:iron ore]], and [[Minecraft:redstone ore]] have been changed.
** Coal ore, iron ore, gold ore, and redstone ore had the shape of the "ore pattern" in the stone changed to make them visually distinct for colorblind players.
** Diamond ore remains mostly the same as it was the most iconic one of the ores that used this shape.

'''[[Minecraft:Beacon]] '''
* Beams are now visible up to 1343 blocks away from the source instead of 256 blocks.

=== World generation ===
[[File:21w07a Approximate ore distribution.jpg|thumb|Ore distribution changes.]]
'''[[Minecraft:Cave]]s'''
* Noise caves and aquifers appear less often.

'''[[Minecraft:Mineral]] distribution'''
* Changed ore generation of all ores making them have a spread value and generate in a triangle distribution<ref>Mistakenly drawn as normal distributions in the generation chart, but corrected in the chart of the next snapshot.</ref> like [[Minecraft:lapis lazuli ore]]. Some still retain a linear generation alongside a spread generation.
* [[Minecraft:Coal ore]], [[Minecraft:emerald ore]], and [[Minecraft:copper ore]] no longer generate below Y=0.
** Copper ore generates between the Y=0 and Y=96 and like all other ores, uses spread. It peaks at Y=48.
** Emerald ore generates above Y=32 (up to Y=480 in custom worlds) as a spread, peaking at Y=256 and decreasing in quantity as the [[Minecraft:altitude]] decreases.
** Coal ore attempts to generate twice: once, evenly between an altitude of Y=136 and Y=256; and as a spread, peaking at an altitude of Y=96 and generating between an altitude of Y=0 and Y=192.
* Other ores also generate differently.
** [[Minecraft:Iron ore]] attempts to generate twice: once as a spread peaking at an altitude of Y=256, generating above Y=128 (up to Y=384 in custom worlds); and another as a spread peaking at Y=32 and generating with a minimum height of Y=-16 and a maximum height of Y=80.
** [[Minecraft:Gold ore]] generates between the altitudes of Y=-64 and Y=32, peaking at Y=-16. The extra gold that generates in the [[Minecraft:badlands]] biome was left untouched.
** [[Minecraft:Lapis lazuli ore]] attempts to generate twice: once, as a spread between the altitudes of Y=32 and Y=-32, peaking at an altitude of 0; and evenly between an altitude of Y=64 and Y=-64, generating buried like [[Minecraft:ancient debris]].
** [[Minecraft:Redstone ore]] attempts to generate twice: once, evenly between an altitude of Y=15 and Y=-64; and as a spread, peaking at an altitude of -64 and generating below an altitude of Y=-32 (down to Y=-96 in custom worlds).
** [[Minecraft:Diamond ore]] now generate as a spread, generating below Y=16 and peaking at altitudes near Y=-64.
* Tweaked size and positioning of [[Minecraft:diorite]], [[Minecraft:andesite]] & [[Minecraft:granite]] generation.
** Pockets of diorite, granite and andesite are now larger and more spherical but less common.
** Diorite, granite, [[Minecraft:gravel]] and [[Minecraft:dirt]] no longer generate below Y=0, but gravel and dirt are more common than in pre-21w06a versions.
* [[Minecraft:Grimstone]] now generates as the dominant stone below Y=0.
** [[Minecraft:Andesite]] still generates unlike [[Minecraft:stone]], [[Minecraft:diorite]], [[Minecraft:granite]], and [[Minecraft:dirt]].

'''[[Minecraft:Mineshaft]]s'''
* [[File:21w07a Mineshaft.jpg|alt=A 1.17 Mineshaft with ceiling supports and oak log supports from the ground |thumb|A 1.17 mineshaft]] Corridors are now supported by [[Minecraft:Iron Chain|chain]]s and oak fences above when the layer is nearer to the ceiling than the floor.
* Wood pillars are now made of [[Minecraft:log]]s instead of [[Minecraft:wood]].

'''[[Minecraft:Stronghold]]s'''
* Are now encased in [[Minecraft:stone]] and/or [[Minecraft:grimstone]], depending on the depth.

=== General ===
'''Creative inventory'''
* The "Redstone Tab" has been reordered to prioritize highly-used blocks.
* Redstone items/blocks have been grouped and ordered in the following way (from top to bottom): Essentials, Unique activators, Miscellaneous, Common activators, Openables.

'''Data packs'''
* Vanilla configured features for ore types have changed:
** Coal and iron have been split into two parts called <code>_upper</code> and <code>_lower</code>.
** New lapis configured feature: <code>ore_lapis_buried</code>.
* The <code>glow_lichen</code> feature now lists grimstone as a valid block.
* Changes to the <code>range</code> decorator configuration:
** <code>bottom_offset</code>, <code>top_offset</code> and <code>maximum</code> fields removed.
** Replaced with <code>bottom_inclusive</code> and <code>top_inclusive</code> which are both a new type of vertical anchoring.
** This type can have several forms:
*** <code>absolute</code> - specifies an absolute Y value.
*** <code>above_bottom</code> - specifies an offset above the minimum Y coordinate of the world.
*** <code>below_top</code> - specifies an offset below the maximum Y coordinate of the world.
* The <code>range_biased</code> and <code>range_very_biased</code> feature decorator are now called <code>range_biased_to_bottom</code> and <code>range_very_biased_to_bottom</code> respectively.
** Both biased types of ranges now have <code>bottom_inclusive</code> and <code>top_inclusive</code> of the same type, and a <code>cutoff</code> value that's a numeric value
* The <code>depth_average</code> decorator also now has its baseline field as a vertical anchor instead of an absolute Y value.
* A whole range of decorators no longer exist or have had part of their functionality replaced by using some of the already existing generic decorators:
** <code>dark_oak_tree</code> decorator no longer does a heightmap check, needs to be done with a <code>heightmap</code> decorator.
** The <code>end_gateway</code> decorator has been split, now used with a combination of <code>chance</code>, <code>square</code> & <code>heightmap</code> - see the <code>end_gateway configuration</code> in the vanilla pack for an example.
** The <code>glowstone_blob</code> feature no longer does its own decoration, instead is used with a combination of <code>square</code> & <code>range</code>. See <code>glowstone_extra</code> in vanilla files for example.
** The <code>lava_lake</code> feature has also been split, now used with <code>chance</code>, <code>square</code>, and <code>range_biased_to_bottom</code>. See <code>lake_lava</code> for an example.
** The <code>water_lake</code> decorator has been removed. Now instead <code>chance</code>, <code>square</code> & <code>range</code>.
** The <code>emerald_ore</code> decorator has been removed. Now instead <code>count</code>, <code>square</code> & <code>range</code>.
** The <code>fire</code> decorator has been removed. Now instead <code>range</code>, <code>square</code> & <code>count</code>.
** The <code>carving_mask</code> no longer has a probability field, replaced with a <code>chance</code> decorator.

'''[[Minecraft:Tag]]s'''
* Added grimstone to the <code>base_stone_overworld</code> block tag and the <code>stone_crafting_materials</code> and <code>stone_tool_materials</code> item tags.
* Added various grimstone variants to the {{cd|slabs|stairs|walls|d=and}} block and item tags.

== Fixes ==
{{fixes|fixedin=21w07a
|;old
|125675|Seagrass placed on the ocean floor can replace ocean monument parts.
|147589|Vines no longer randomly generate in jungles.
|183547|Stone and polished blackstone buttons/pressure plates are located at opposite ends of the spectrum of buttons in the Creative inventory despite being identical in behavior.
|;dev
|208613|Amount of players who need to sleep to skip the night is calculated incorrectly.
|208618|Clicking on a bed immediately skips the night if gamerule <code>playersSleepingPercentage</code> is set to 0.
|211224|Seagrass can occasionally replace parts of a swamp hut.
|214082|Crash after placing soul sand or magma under 2032-block-tall water.
|;previous
|214814|Strongholds generate floating and without walls, floors, or ceilings when inside caves.
|214885|Beacon beam only render 256 blocks from source.
|214917|Lapis Lazuli doesn't generate on the lower levels of the world.
|214928|Mineshaft corridor support pillars are made out of wood, not logs.
|214973|Powder snow bucket in a dispenser at Y{{=}}319 facing upwards or at Y{{=}}-64 facing downwards is replaced with empty bucket, despite no powder snow being placed.
|214986|Large dripstones only generate as stalagmites below Y{{=}}0.
}}</onlyinclude>

== Videos ==
{{slicedlime|9AiudiWFG8g|3vdIff3kyPA}}

== Gallery ==
<gallery>
Grimstone ores.jpg|Ores with a grimstone background. The textures were made by [[Minecraft:JAPPA]], and were implemented on the following snapshot.<ref>{{tweet|henrikkniberg|1362095363314876418|Grimstone is a new basestone that generates at negative Y. @JasperBoerstra made some nice matching textures for the ores, but it barely missed this week's snapshot train. Will come later. So don't pester him (too much) about ugly ore blocks at negative Y :)|February 18, 2020}}</ref>
21w07a Mineshaft.jpg|A [[Minecraft:mineshaft]] generating with [[Minecraft:Iron Chain|chain]]s and [[Minecraft:log]]s.
</gallery>

== References ==
{{Reflist}}

== Navigation ==
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Minecraft:Java Edition 21w07a - Revision history

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