The Meteorite Biome is an unatural biome that has a 50% chance of appearing on the night after a Shadow Orb is destroyed. It spawns Meteor Heads and is created when 50 or more Meteor Ore is places in close proximity. Meteor blocks are Fire Blocks and will burn on contact without an Obsidian accesory. Meteor is a rare luxury and should be harvested as soon as one appears. One Meteorite will give about 250-300 Meteorite Ore unless it lands on a skybridge/house. Meteors do not create blocks they just replace them so if they land on a skybridge they will yield very little ore. To protect you Npcs from the Meteor Heads build a shield above your houses about 10 blocks thick so you still get your ore while your npcs are safe.