This is what we call MGO board or "dragon board". It is what we are using instead of drywall board throughout our house. It is made of Magnesium Oxide, and is heavy like a thin sheet of concrete.
It is manufactured from mineral components and water, contains no organic solvents, asbestos, petroleum, formeldahyde or toxins. No energy is consumed during the manufacturing of this, as the entire process is conducted at room temperature. Next week we have clay going on the walls... can't wait to share that process!