Onyx

Onyx is an un-released ore, scheduled to come out in Version 1.2. It will be the highest tier ore in Ores Extended, surpassing Crystal.

Onyx
Onyx will be the only ore to spawn in the Nether currently and is the strongest ore currently available in Ores Extended. Onyx will be extremely rare and spawn in the lower of the Nether.

Trivia

 * A small image (the same shown above) was spoiled on the forums before the patch notes of Version 1.2, showing a new ore for the Nether.