Infested Blocks aka Monster Egg is block were it will spawn silverfish when destroyed, we have a few infested blocks those are infested stones so in this addon we have more other than infested stones only.

Infested stones cannot be craft but due to a Minecraft bug that we can't add custom blocks in creative inventory I make them craftable, but still cannot obtain via survival because its recipe is silverfish spawn egg and your block of choice will combine in crafting table just like below.

Here are all available blocks that can convert into Infested Block

• Andesite
• Basalt
• Bedrock
• Blackstone (all types)
• Block of Coal
• Block of Diamond
• Block of Emerald
• Block of Gold
• Block of Iron
• Block of Netherite
• Block of Quartz (all types except smooth)
• Block of Redstone
• Bone Block
• Bookshelf
• Brick Block
• Carpet
• Coarse Dirt
• Concrete (all colors)
• Concrete Powder (all colors)
• Coral Blocks (all types)
• Crafting Table (functional)
• Crimson Nylium
• Crying Obsidian
• Diorite
• Dirt
• Dried Kelp Block
• End Stone
• End Stone Bricks
• Glowstone
• Granite
• Gravel
• Hay Bale
• Honeycomb Block
• Lapis Lazuli Block
• Log/Stem (all types)
• Mossy Cobblestone
• Mycelium
• Netherrack
• Nether Bricks (all type)
• Nether Wart Block
• Obsidian
• Ores (all type)
• Planks (all types)
• Podzol
• Polished Andesite
• Polished Basalt
• Polished Diorite
• Polished Granite
• Prismarine (all types)
• Purpur Block
• Purpur Pillar
• Redstone Lamp (can turn on)
• Sand
• Sandstone (all types including red)
• Sea Lantern
• Shroomlight
• Smooth Stone
• Soul Sand
• Soul Soil
• Terracotta (unstained & all colors)
• TNT (can ignite)
• Warped Nylium
• Warped Wart Block
• Woods/Hyphae (all types)
• Wool (all colors)