/ stone axe can be crafted with the following recipes

Autolearned
Player Recipe
Primary skill used: survival(3)
Required skills: fabrication(2)
Time to complete: 60 minutes
Tools required:
> 1 tool with hammering quality of 1
Components required:
> 1x heavy stick OR 1x plank
> 1x rock OR 1x ceramic shard OR 1x sharp rock
> 2x short string OR 2x short cordage piece OR 100x thread OR 100x sinew OR 100x plant fiber OR 100x yarn OR 100x thread OR 100x sinew OR 100x plant fiber OR 100x yarn
Byproducts:
(none)
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This recipe can be found in the following books when survival is at least the required level:
Outdoor Adventures (level 1)
Survival Under Atomic Attack (level 1)
Engineering 301 (level 2)