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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 and deepslate. 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, deepslate, andesite, diorite, granite and tuff. (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
Iron Ore
Copper Ore
Lapis Lazuli Ore
Redstone Ore
Emerald Ore(Only in Windswept Hills
Infested Stone(Only in Windswept Hills

Andesite

Diorite
Granite
Polished Andesite
Polished Diorite
Polished Granite
Stone

Deepslate Coal Ore

Deepslate Diamond Ore
Deepslate Gold Ore
Deepslate Iron Ore
Deepslate Copper Ore
Deepslate Lapis Lazuli Ore
Deepslate Redstone Ore
Gravel
Tuff
Deepslate Emerald Ore(Only in Windswept Hills
Infested Deepslate(Only in Windswept Hills

Deepslate

Tuff

Nether Ancient Debris
Basalt

Blackstone
Netherrack

Blackstone

Gravel
Nether Gold Ore
Nether Quartz Ore
Magma Block
Soul Sand

Netherrack

The Overworld[]

Block Spawn size Spawn tries Minimum height Maximum height Biomes
Dirt 1~33 7 0 160 All
Gravel 1~33 14 -64 320 All
Granite 0~64 2 0 60 All
6 64 128
Diorite 0~64 2 0 60 All
6 64 128
Andesite 0~64 2 0 60 All
6 64 128
Tuff 0~64 2 -64 0 All
Coal Ore
Deepslate Coal Ore
1~17 20 [note 2] 0 192 All
30 136 320
Iron Ore
Deepslate Iron Ore
1~4 10 -64 72 All
1~9 10 -24 56
90 80 320
Copper Ore
Deepslate Copper Ore
0~10 16 -16 112 Other
0~20 Dripstone Caves
Redstone Ore
Deepslate Redstone Ore
1~8 4 -64 16 All
8 -64 -32
Lapis Lazuli Ore
Deepslate Lapis Lazuli Ore
1~7 2 [note 3] -32 32 All
4 -64 64
Gold Ore
Deepslate Gold Ore
1~9 4 [note 2] -64 32 All
50 28 256 Badlands
Diamond Ore
Deepslate Diamond Ore
1~4 7 [note 2] -64 16 All
1~8 4
1~12 9
Emerald Ore
Deepslate Emerald Ore
1~3 100 -16 320 Windswept Hills
Infested Stone
Infested Deepslate
0~9 14 -64 63 Windswept Hills

Upcoming[]

In Java Edition :

[more information needed]

In Bedrock Edition :

This table below based on beta 1.18.10.21

Block Spawn size Spawn tries Minimum height Maximum height Blob concentrate[note 4] Air exposed chance[note 5] Biomes
Dirt 33 7 0 160 Uniform[note 6] 100% All
Gravel 33 14 -64 319 Uniform[note 6] 100% All
Granite 64 2 0 60 Uniform[note 6] 100% All
Upper Granite[note 7] 64 1 64 128 Uniform[note 6] 100% All
Diorite 64 2 0 60 Uniform[note 6] 100% All
Upper Diorite[note 7] 64 1 64 128 Uniform[note 6] 100% All
Andesite 64 2 0 60 Uniform[note 6] 100% All
Upper Andesite[note 7] 64 1 64 128 Uniform[note 6] 100% All
Tuff 64 2 -64 0 Uniform[note 6] 100% All
Coal Ore

Deepslate Coal Ore[note 8]

17 20 0 192 Higher frequency toward center[note 9] 50% All
Upper Coal Ore

Deepslate Coal Ore[note 8]

17 30 136 319 Uniform[note 6] 100% All
Copper Ore

Deepslate Copper Ore[note 8]

10 16 -16 112 Higher frequency toward center[note 9] 100% Any Overworld biomes except Dripstone Caves[note 10]
Lower Iron Ore

Deepslate Iron Ore[note 8]

4 10 -64 72 Uniform[note 6] 100% All
Middle Iron Ore

Deepslate Iron Ore[note 8]

10 10 -24 56 Higher frequency toward center[note 9] 100% All
Upper Iron Ore

Deepslate Iron Ore[note 8]

10 90 80 319 Higher frequency toward top[note 9] 100% All
Redstone Ore

Deepslate Redstone Ore[note 8]

8 8 -64 -32 Higher frequency toward bottom[note 9] 100% All
Extra Redstone Ore

Deepslate Redstone Ore[note 8]

8 4 -64 15 Uniform[note 6] 100% All
Lapis Lazuli Ore

Deepslate Lapis Lazuli Ore[note 8]

7 2 -32 32 Higher frequency toward center[note 9] 100% All
Extra Lapis Lazuli Ore

Deepslate Lapis Lazuli Ore[note 8]

7 4 -64 64 Uniform[note 6] 0% All
Gold Ore

Deepslate Gold Ore[note 8]

9 4 -64 32 Higher frequency toward center[note 9] 50% All
Extra Gold Ore[note 11]

Deepslate Gold Ore[note 8]

9 1 -64 -48 Uniform[note 6] 100% All
Diamond Ore

Deepslate Diamond Ore[note 8]

4 7 -64 16 Higher frequency toward bottom[note 9] 50% All
Extra Diamond Ore[note 12]
Deepslate Diamond Ore[note 8]
12 1 -64 16 Higher frequency toward bottom[note 9] 30% All
Additional Extra Diamond Ore[note 13]
Deepslate Diamond Ore[note 8]
8 4 -64 16 Higher frequency toward bottom[note 9] 0% All
Mountain Peaks Extra Coal Ore[note 14]

Deepslate Coal Ore[note 8]

17 20 128 256 Uniform[note 6] 50% Frozen Peaks

Grove
Jagged Peaks
Meadow
Snowy Slopes
Stony Peaks

Dripstone Caves Copper Ore[note 15]

Deepslate Copper Ore[note 8]

20 16 -16 112 Higher frequency toward center[note 9] 100% Dripstone Caves
Emerald Ore

Deepslate Emerald Ore[note 8]

3 100 -16 319 Higher frequency toward top[note 9] 100% Frozen Peaks

Gravelly Mountains+
Grove
Jagged Peaks
Meadow
Mountain Edge
Snowy Slopes
Stony Peaks
Windswept Forest
Windswept Gravelly Hills
Windswept Hills

Badlands extra Gold Ore[note 16]

Deepslate Gold Ore[note 8]

9 50 32 256 Uniform[note 6] 100% Badlands
Badlands Plateau
Eroded Badlands
Modified Badlands Plateau

Modified Wooded Badlands Plateau
Wooded Badlands

Lush Caves Clay[note 17] 33 46 -64 256 Uniform[note 6] 100% Lush Caves
Infested Stone[note 18]
Infested Deepslate[note 8]
8 14 0 64 Uniform[note 6] 100% Frozen Peaks

Gravelly Mountains+
Grove
Jagged Peaks
Meadow
Mountain Edge
Snowy Slopes
Stony Peaks
Windswept Forest
Windswept Gravelly Hills
Windswept Hills

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 19] 3 1 8[note 20] 22[note 20] All
Ancient Debris[note 19] 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 When an ore block is about to be placed,if it is exposed to air then it has a chance of being skipped instead.
  3. No air exposure.
  4. Blobs generate using either uniform distribution, or gaussian distribution. Uniform distribution have all blobs spread in same frequency, while gaussian generate more frequent in specific altitude and generate less outside concentrated height.
  5. chance for block to generate if blob exposed to air
  6. a b c d e f g h i j k l m n o p q r Same frequency at any height within min height and max height
  7. a b c There is 16% chance for each chunk to generate these extra blobs.
  8. a b c d e f g h i j k l m n o p q r s t Generate as deepslate variant when replacing deepslate.
  9. a b c d e f g h i j k l These use normal periodic distribution/gaussian distribution.
  10. Dripstone caves biome are excluded in this blob placement.
  11. There is 50% chance for each chunk to generate extra gold blobs.
  12. There is 19 chance for each chunk to generate extra diamond blobs.
  13. There is 50% chance for each chunk to generate these additional diamond blobs.
  14. This is the extra rolls for coal ore in mountain peaks biomes.
  15. This is the extra rolls for copper ore in dripstone caves biomes.
  16. This is the extra rolls for gold ore in badlands biomes.
  17. Not only lush caves floor generate clay, clay also generate as blobs in lush caves biomes.
  18. Infested stone in Bedrock Edition placed/generate attached to cave floor instead anywhere underground/buried
  19. a b Ancient Debris can generate in 2 different ways.
  20. a b 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 8 and 16 for Ancient Debris. Meaning that Ancient Debris generate mostly around level 15; i.e. a periodic gaussian distribution.

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 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]
Tuff blobs now generate below Y=0.
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.
21w13aDeepslate blobs now generate between Y=0 and Y=16.
21w14aTuff blobs now generate between Y=0 and Y=16 as well.
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.
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.
experimental snapshot 4Bigger copper ore blobs can now generate in dripstone caves.

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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