Obsidian

Obsidian is a type of block found in the new update 0.28_01. It's color is dark purple and dark blue, it's sort of like the bedrock, but its main color is purple. The texture is possibly rough, from the looks of the block, it looks very rough.

Obsidian is never to be found in a generated map, rumors were that obsidian was cooled off lava, which could emerge if it collides with water. Obsidian is a great block to use for art, especially when you use a lot of black.