The Obsidian Floor is a midnight blue glossy and smooth building-block.
The block can be rotated by pressing and holding R and moving the mouse while holding the left mouse button.
It can be crafted in your Crafting Menu (default key "q") after the according crafting recipe has been unlocked upon by
- creating Obsidian Rods by putting Obsidian (bars) into a Processor
- crafting Obsidian Brick Walls
- crafting Stone Floors
To craft 8 blocks of Obsidian Floors at a time, you'll need (as of R44 in June 2017):