Flint
From The Blockheads Wiki
Flint
One of the most useful things in Blockheads, Flint is an essential item to make tools at the start of the game. It is very easy to find, so don't panic if you need some. It is used to craft Flint Spears, Flint Machetes, Flint Pickaxes, Flint Axes, and Flint Spades. It is also used to make a Tool Bench, etc.