Crying Obsidian

Mystery block refers to an abandoned project by Jeb to implement a change-spawn obelisk. It can only be found in the form of a texture in "terrain.png". This texture has been added in Beta 1.3 but is currently not used in the game. It closely resembles obsidian, mostly due to the matching colors. It also appears to be a sandstone texture modified to look like obsidian. There is no indication yet as to whether this texture will be implemented in the future.

It is also known as "Bleeding Obsidian", "Crying Obsidian" and "The Meteorite" among many members for its appearance.