Glowing Obsidian

Glowing Obsidian is a block which only generates when the Nether Reactor is activated. Upon activation, the blocks that make up the reactor turn into Glowing Obsidian. Glowing obsidian is almost purely decorative, but can be used as a blast resistant bunker material.

Properties
As the name suggests, Glowing Obsidian is a solid block that gives off light similar to Glowstone, but slightly dimmer. It does indeed glow, but its physical properties are closer to Obsidian. It takes the same amount of time to mine as Obsidian. Instead of dropping itself, it drops a normal Obsidian block. The block will emit red smoke particles within close proximity to it so long as it exists, similar to the particles Redstone creates when activated. Although in the Nether Reactor the block seems to spawn items around it, it is not the block itself that acts like this, nor will it spawn items if placed normally. The block turns into obsidian after a short amount of time. Otherwise it is simply an aesthetic block, as it has the same blast resistance as normal Obsidian.

Trivia
- if you mine out the gold blocks before they are changed to glowing obsidian, you keep the gold blocks and the Nether Reactor keeps spawning items
 * If the Nether Reactor Core is mined out while the Nether Reactor is active, the glowing obsidian will not turn into Obsidian after the reactor deactivates. This also causes the reactor to stop spawning items.
 * Glowing Obsidian can only be obtained by inventory hacks

Gallery
Leuchtendes Obsidian Obsidienne lumineuse Светящийся обсидиан 发光的黑曜石