Monster Egg (also known as Silverfish Block or Block 97; called Silverfish Stone/Cobblestone/Stone Brick in Xbox 360 Edition) is a block that spawn Silverfish when broken. Monster Eggs have identical looks to either stone, cobblestone, or stone brick, and are naturally found in strongholds and rarely in Extreme Hills biomes, hiding among the true blocks. When breaking it with a pickaxe it takes noticeably longer to mine than regular stone, cobblestone, or stone brick, making it relatively easy to distinguish from the regular blocks, if one is careful enough. The block can also be destroyed by hand fairly quickly, unlike regular stone blocks. Mining a Monster Egg with a Silk Touch enchantment does not give the player a Monster Egg block, but the type of block that the Monster Egg is disguised as.