Netherrack

Netherrack is a rock-like block found in the Nether.

Obtaining
Netherrack can only be collected with a pickaxe.

Natural generation
Netherrack makes up most of the Nether's terrain.

Endermen
Endermen can pick up netherrack, and will drop the block they are holding if killed.

Usage
When netherrack's top is lit on fire, the fire will burn indefinitely.