dec: 97 hex: 61 bin: 1100001
Monster Egg (also known as Silverfish Block; called Silverfish Stone, Silverfish Cobblestone, and Silverfish Stone Brick in Xbox 360 Edition) is a block that spawns Silverfish when broken. Monster Eggs have identical looks to either stone, cobblestone, or stone brick.
Monster Eggs take the same amount of time to break with any tool. This is useful, because it can be mined faster then stone, and slower when using a pickaxe, making it relatively easy to distinguish from the actual blocks. When the block is broken, a silverfish spawns where it was broken.
Mining a Monster Egg with a silk touch tool drops the block that the Monster Egg is disguised as, and does not spawn the silverfish.
 Natural Generation
Monster Eggs are available in the inventory in creative. They can also be made by placing a stone, cobblestone, or stone brick and then using a silverfish spawn egg on it. Attempting to add more Silverfish into the block will result in the silverfish spawning normally.
Monster Eggs are meant to deceive players. When mined, it will spawn a Silverfish which will instantly attack the player. If the player attacks a silverfish directly with a sword, bow or potion of harming, or when a silverfish takes poison damage, nearby Monster Eggs will break, spawning other aggressive Silverfish.
When a silverfish is not pursuing the player, the Silverfish will go to the nearest stone, cobblestone, or stone brick and try to go inside it, converting the block into a Monster Egg. When mined, the spawned Silverfish will have full health.
 Data values
|0||Stone Monster Egg|
|1||Cobblestone Monster Egg|
|2||Stone Brick Monster Egg|
|3||Mossy Stone Brick Monster Egg|
|4||Cracked Stone Brick Monster Egg|
|5||Chiseled Stone Brick Monster Egg|
|1.8||1.8-pre1||Added Block 97.|
|1.3.1||12w17a||Block 97 is now labeled as Stone Monster Egg, Cobblestone Monster Egg, or Stone Brick Monster Egg depending on what kind of block it is.|
|12w21b||Monster Eggs are now available in the Creative mode inventory.|
|1.4.2||12w38a||Stone Monster Eggs will now rarely generate in Extreme Hills biomes.|
|1.6.1||13w17a||Silverfish will not cause monster eggs to break when gamerule "mobGriefing" is set to false.|
|1.7.2||13w36a||Added Mossy Stone Brick Monster Egg, Cracked Stone Brick Monster Egg and Chiseled Stone Brick Monster Egg variants.|
Issues relating to "Monster Egg" are maintained on the issue tracker. Report issues there.
- If the Ender Dragon destroys a Monster Egg, no Silverfish is spawned.