Forge Rock is a very hard, light blue material in my upcoming game "Enter The Flesh Again". It is used by creatures such as Tuyaos, Yuvustus and Hushin for stonemasonry to make weapons and other tools. There are ancient ruins and strange statues scattered throughout the world that include Forge Rock in their elaborate designs. Sometimes Forge Rock can be used to interact with these old structures, like opening their doors.
Urichov
Cool but I don't think it counts as either fauna or flora.
SeethingSwarm (Updated )
That's true. I guess this can be a little exception for this category :P