Small Stones are Rocks. They are the smallest type of rock, but they are so useful in that they create many of the tool heads on Stranded. Because they create many tools, it's important to gather only those of the highest Quality.
Small Stones can be immediately crafted into a Hammerstone, which in itself is immensly useful.
Hammerstones can then in turn process many raw material, such as Small
Stones, into useful tool heads and handles.