Nether Reactor Core

The Nether Reactor Core is a block. It is the main component in constructing the Nether Reactor. It is the only way to obtain Glowstone, Nether Quartz and Melon in-game as of 0.6.0.

Crafting
Crafting the Nether Reactor Core requires three diamonds and six iron ingots. Maybe also takes you to the nether?