Content inaccessible in Survival

There are many elements in Minecraft that are completely inaccessible to the player in Survival mode. This is due to many factors, such as game balance, or due to the fact that the player accessing certain content would not have any logical sense in the context of playing Survival mode, such as barrier blocks and spawn eggs.
The article encompasses all things unavailable to the player in Survival. Note that many - if not all - of the listed content can still be obtained in Creative mode, with the use of commands, or mods.
== Blocks ==
The following blocks cannot be encountered in normal Survival gameplay:
=== Creative and mapmaking tools ===
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=== Others ===
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** unless brought in from an earlier version where they were obtainable normally
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== Items ==
=== Creative and mapmaking tools ===
* Item forms of all blocks and entities listed in the respective sections elsewhere
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=== Encounterable in block form, but not item form ===
The following blocks have direct item forms. The blocks themselves can be encountered in Survival, but their item forms cannot.
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=== Others ===
* Item forms of all blocks listed in the respective section above
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== Entities ==
=== Creative and mapmaking tools ===
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=== Mobs ===
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== Biomes ==
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== Effects ==
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