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" 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.

Trivia
In 1.9 pre-release. water and lava particles leak through blocks. making Crying Obsidian viewable. But not obtainable.