Knapping
Knapping is the process of using two rocks to create heads for stone tools.
Right clicking with a stack of two or more rocks will open a GUI for knapping a rock into a tool head. This is done by replicating the shape of the wanted tool by clicking tiles on the grid to remove them.
The tool head can then be attached to a stick in the crafting grid to create a stone tool.
Knapping Patterns
Axe Head
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Hammer Head
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Hoe Head
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Javelin Head
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Knife Blade
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Shovel Head
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Durability of Stone Tools
There are four types of stone: Sedimentary, Metamorphic, Igneous Intrusive and Igneous Extrusive (In order of increasing durability).