Lihzahrd Brick

Lihzahrd Bricks make up the structure of the Jungle Temple. They are the toughest block in the game, being impervious to explosives and only breakable using the strongest pickaxe in the game, the Picksaw. They also cannot be made inactive using actuators until Plantera has been defeated.

Like jungle grass, placing enough Lihzahrd Bricks in one area will create an artificial Jungle biome. This is not useful for growing jungle plants or spawning jungle monsters, as both require the grass, but makes setting up a Jungle Key farm easier once the Picksaw has been secured, as one does not need to wait for grass to spread.

Bugs
The Lihzahrd Altar does not always spawn inside the Lihzahrd. This bug occurs during world generation, so a new world must be explored to find the Lihzahrd Altar (http://www.terrariaonline.com/threads/1-2-lihzahrd.107843/, verified in a world on 11/15/2013, using the latest patch). (Fixed as of 1.2.3 (please confirm))