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Not to be confused with Ore vein.
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Various blobs, in the form of patches of ore, dirt, diorite, granite, tuff, andesite, deepslate and gravel.

A blob[1][2][3] is a terrain feature consisting of a natural deposit of ores or other blocks in the ground.

Generation[]

Blobs can generate in caverns or anywhere where there is natural stone. Underground deposits of dirt and gravel are generated in this step, followed by the more precious ores: coal, iron, gold, redstone, diamond, emerald (in mountains biomes) and lapis lazuli. They can form only in stone, andesite, diorite and granite (also in their polished variants, replacing parts of structures), and do not replace each other or any other block. Two or more blobs can form next to each other and appear as a blob made of more than one material.

List[]

Dimension Block Can replace[note 1]
Overworld Andesite

Clay
Coal Ore
Diamond Ore
Diorite
Dirt
Gold Ore
Granite
Gravel
Infested Stone
Iron Ore
Copper Ore
Lapis Lazuli Ore
Redstone Ore
Tuff

Andesite

Diorite
Granite
Polished Andesite
Polished Diorite
Polished Granite
Stone

Emerald Ore Stone

(Only in mountains biomes).

Nether Ancient Debris
Basalt

Blackstone
Netherrack

Blackstone

Gravel
Nether Gold Ore
Nether Quartz Ore
Magma Block
Soul Sand

Netherrack

The Overworld[]

This section is missing information about generation of emerald ore (see here), does this match up with the values provided on the table below?. 
Please expand the section to include this information. Further details may exist on the talk page.
Block Spawn size Spawn tries Minimum height Maximum height Biomes
Dirt 33 10 0 255 All
Gravel 33 8 0 255 All
Granite 33 10 0 79 All
Diorite 33 10 0 79 All
Andesite 33 10 0 79 All
Coal Ore 17 20 0 127 All
Iron Ore 9 20 0 63 All
Copper Ore 9 20 0 63 All
Redstone Ore 8 8 0 15 All
Lapis Lazuli Ore 7 1 0[note 2] 30[note 2] All
Gold Ore 9 2 0 31 All
Diamond Ore 10 1 0 15 All
Emerald Ore 1 11 4 31 Gravelly Mountains
Gravelly Mountains+
Mountains
Mountain Edge
Wooded Mountains
Gold Ore[note 3] 9 20 32 79 Badlands
Badlands Plateau
Eroded Badlands
Modified Badlands Plateau
Modified Wooded Badlands Plateau
Wooded Badlands Plateau
Infested Stone 9 7 0 63 Gravelly Mountains
Gravelly Mountains+
Mountains
Mountain Edge
Wooded Mountains

The Nether[]

This section is missing information about Java Edition patches, do they match Bedrock; 20w21a basalt deltas changes; does soul sand truly generate as a blob? apparently it doesn't show up in the same region of code}. 
Please expand the section to include this information. Further details may exist on the talk page.
Block Spawn size Spawn tries Minimum height Maximum height Biomes
Magma Block 33 4 27 36 All
Nether Quartz Ore 14 16 10 117 All
Nether Gold Ore
10 10 10 117 All
Ancient Debris[note 4] 3 1 8[note 2] 22[note 2] All
Ancient Debris[note 4] 2 1 8 119 All
Soul Sand
[check the code]
12 12 1 32 Soul Sand Valley
Gravel
[check the code]
33 2 1 32 Nether Wastes

Crimson Forest
Warped Forest
Soul Sand Valley

Blackstone
33 2 1 32 Nether Wastes

Crimson Forest
Warped Forest
Soul Sand Valley
Basalt Deltas

  1. can replace the same type block, if the replaced block aren't part of the said blob.
  2. a b c d This distribution follows its own rules: instead of a minimum and a maximum height, it is based on a center height and a spread value. By default, these values are set to 16 and 16 for Lapis Lazuli and 8 and 16 for Ancient Debris. Meaning that Lapis Lazuli and Ancient Debris generate mostly around level 15; i.e. a periodic gaussian distribution.
  3. This is the extra rolls for gold ore in badlands biomes.
  4. a b Ancient Debris can generate in 2 different ways.

Data values[]

ID[]

NameResource location
[No displayed name]ore

History[]

This section is missing information about other editions' information, all the 1.13 changes and 21w08a tuff and 21w10a lush caves clay blob generation and details. 
Please expand the section to include this information. Further details may exist on the talk page.
Java Edition Infdev
20100325Blob generation is implemented.
20100617-2Added underground blobs of dirt and gravel.
Java Edition Alpha
v1.0.1Added blobs of redstone ore.
Java Edition Beta
1.2Added blobs of lapis lazuli ore.
Iron and diamond ore blobs are now larger on average.
1.6Test Build 3Fixed ore density varying per quadrant from the center of the world.
1.8Pre-releaseThe highest layer for some ores has been lowered by 2.
Java Edition
1.3.112w21aAdded blobs of emerald ore to Extreme Hills and Extreme Hills Edge biomes.
12w22aEmerald ore now generates as single blocks.
1.4.212w38aStone monster eggs now generate underground in extreme hills biomes.
1.513w01aAdded blobs of nether quartz ore to the Nether.
1.814w02aAdded blobs of granite, diorite, and andesite to overworld generation.
14w17aAdded custom worlds allowing for ore customization.
14w29aOre now generates faster.
1.1016w20aAdded magma block blobs to the Nether. Whether they generated differently upon introduction and were changed later is unknown.
Added extra gold ore blobs to the mesa biome and its variants.
1.1620w06aAdded ancient debris, which generates in the Nether in two different blob specifications.
20w11aAdded nether gold ore to the Nether.
20w19aAdded blobs of blackstone and gravel to Nether wastes, soul sand valley, crimson forest and warped forest biomes.
Added underground soul sand blobs to the soul sand valley.
Basalt and blackstone can be replaced by nether ores, like with netherrack.[is this the correct version?]
1.16.220w28aNo longer use 32-bit floats for generation, which used to cause a crash when using mods to generate terrain between 67,108,864 and 134,217,728 blocks.
October 3, 2020Announced copper ore, which generates in a different vein type from all other ores.
1.1721w06aThe height limit was expanded down to Y=-64. All ores are temporary generating from Y=-64 instead of Y=0 [needs testing]
21w07aOre distribution has changed.
21w08aOre distribution has changed once again.
Iron ore no longer generates as often due to a bug.[4]
21w08bIron ore now generates correctly again.
Redstone ore generation is tweaked, removing flat ore distribution under Y=12.
21w10aOre distribution has changed for a third time.
21w15aOre distribution (except copper) has been reverted to pre-1.17 values, to accommodate for the split of Caves & Cliffs.
21w18aOre distribution has changed again, but only if the Caves & Cliffs Prototype Data Pack is applied to a world.
Upcoming Java Edition
1.18Experimental Snapshot 1Ore distribution has changed for a fifth time, and a data pack is no longer required for these changes to be seen.

Gallery[]

References[]

  1. "Minecraft Snapshot 20w45a" – Minecraft.net
  2. "Minecraft Snapshot 21w13a" – Minecraft.net
  3. "Minecraft Changelog 1.17.0.50" – Minecraft.net
  4. MC-216744 – "Iron ore doesn't generate (only iron ore in deepslate is generated)" – resolved as "Fixed"
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