Glowstone Cluster

Glowstone Cluster is a naturally generated structure that spawns commonly in the Nether dimension. It consists of a vein of Glowstone blocks. It can be helpful in gathering of Glowstone Dust, although it may be hard to reach due to the fact they only generate on the ceiling of The Nether.

It will be added in Update 0.12.0.

Generation
Glowstone Clusters form in coral-like structures on the underside of hanging Netherrack, so they are often found on the ceilings of the Nether, where they provide luminosity. They are hard to mine since they generate on the ceiling of the Nether.

Trivia

 * Glowstone Clusters can be created artificially be placing Glowstone blocks.
 * Glowstone Clusters form similarly to Mineral Veins.