Rocks are grey, and they come in 3 sizes: Small , Medium , and Large, also known as a Boulder.
Small Stone[]
Small Stone are the smallest, and are the basis of many handled tools, and some small non-handled tools. Examples would be a Hammerstone and Stone Awl.
A Small Stone.
Medium Rock[]
Medium Rocks are a bit bigger, and are found in larger tool heads and larger tools, such as the Stone Bucket and the Quernstone
A Medium Rock.
Boulder[]
The largest rock. Aids in the creation of Stone Buildings.
A Boulder.