Loose stones and rocks which can be found breaking free of their foundations about Calydon can be collected. It can be found in virtually limitless supply. Stone is very heavy, so it is difficult to carry large volumes of rocks. While they are not mechanically complex, mineral structures also take up a tremendous amount of storage space in your Cavelink Matrix.
Rocks can be used as simple bludgeoning weapons, but they are prone to easily break.
While cumbersome, stone is great for building permanent structures.
Rocks can be disassembled into inorganic scrap via the Matrix.