Glowstone

Glowstone is a decorative block used for illumination. It melts Ice and Snow near it, and drops 2-4 Glowstone Dust when broken. It spawns in Glowstone Clusters in the Nether. Glowstone Dust can be used in Potions.

Crafting

 * 4 Glowstone Dust => 1 Glowstone
 * 1 Glowstone + 4 Redstones => 1 Redstone Lamp

Trivia

 * Before the name was officially confirmed, Glowstone was also called lightstone, brimstone, and australium.
 * When Glowstone is broken, it has the same sound effect as breaking Glass and Ice.
 * It can provide light underwater, unlike Torches.
 * Also, it emits a light of 15, while torches emit 14.
 * Glowstone emits the same light level as the Sun, Fire, and Redstone Lamps.
 * Before Update 0.12.1, Glowstone could be only obtained by the Nether Reactor.
 * Glowstone can melt Ice.