Meteorite

Obtained from meteorite crash sites (caused by breaking a Shadow Orb), requires a Gold Pickaxe or higher to mine. The meteorite, once fallen, can be located in almost any place in the world map, even underwater at the edges of the map and on the floating islands, so every inch of the surface should be scoured when the meteorite lands to find it.

Due to being available in large amounts (once available at all), six ores are required to make a Meteorite Bar.

Use caution when mining as contact with the stone itself causes damage unless equipped with an Obsidian Skull. You do not need an Obsidian Skull to mine it, but it is recommended. The area is also guarded by Meteor Heads.

A good way to mine it all fast is to use Dynamite or some Bombs. This will most likely stop the spawning of Meteor Heads as they will only spawn as long as there are at least 50 Meteorite blocks in the area. When you have removed enough blocks, the music changes back to normal.

A player could also equip a Cobalt Shield and let the Meteor Heads hit them while mining. A player can also get all the Meteor Heads on one side and then mine while keeping the Meteor Heads away with knockback by hitting them with the pickaxe.