Infested Chiseled Stone Bricks are a disguised trap block that looks identical to regular Chiseled Stone Bricks but releases a silverfish when broken in Survival mode. The block generates naturally only inside igloo basements beneath the snowy structure, not in strongholds — a common misconception, since other infested stone variants do appear in strongholds. The hardness of 0.75 and blast resistance of 0.75 mean Infested Chiseled Stone Bricks break roughly twice as fast as a genuine Chiseled Stone Bricks block. A pickaxe is the fastest tool, and the texture is completely non-flammable. Silk Touch does not yield the infested item itself; instead, Silk Touch drops a plain Chiseled Stone Bricks block and suppresses the silverfish spawn, leaving the Creative inventory or a console command as the only ways to obtain a placeable Infested Chiseled Stone Bricks item.

The real danger of Infested Chiseled Stone Bricks is the silverfish chain reaction: attacking one spawned silverfish wakes every nearby infested block, which then breaks open and releases more silverfish. A single careless hit can flood a basement with dozens of silverfish, so the safe play is to kill each silverfish in one hit before it calls for reinforcements, or to break Infested Chiseled Stone Bricks on Peaceful difficulty where no silverfish spawn at all. For builders, Infested Chiseled Stone Bricks work as a hidden alarm system in adventure maps and traps, because the visual texture is indistinguishable from regular Chiseled Stone Bricks at a glance. Note blocks placed on top produce harp sounds in Java Edition and flute sounds in Bedrock Edition, a subtle audio tell that a careful player can use to detect an infestation without breaking anything. The block was added to Java Edition in snapshot 13w36a (version 1.7.2) and to Bedrock Edition in Pocket Edition Alpha 0.9.0.