Crying Obsidian

Crying obsidian refers to a leaked, abandoned project by Jeb to implement a change-spawn obelisk.

This texture was added in Beta 1.3 but was never used in the game. It closely resembles obsidian. It also appears to be a sandstone or a bedrock texture modified to look like obsidian. It is also known as "Bleeding Obsidian", "Mystery Block","The Meteorite" and "super obsidian" among many members for its appearance.

In Beta 1.5, the texture slot for crying obsidian was replaced by a grayscale replacement of the side of grassy dirt blocks, which is used for biome-compliant grassy dirt block sides. It's likely that this block has been removed for good.