A Sulfur Boulder is a rock you break with a pickaxe to get Sulfur.
KindResource boulder
GivesSulfur
PickaxeFlint Pickaxe
Spots on the map137
Named places6
A Sulfur Boulder is a rock you break with a pickaxe to get Sulfur. You need a Flint Pickaxe for it, which mines Sulfur, Copper, Coal, Flint and Stone; the Stone Pickaxe only handles Flint and Stone, so it will not touch this one. Aim at a boulder and the prompt shows its name next to a pickaxe icon. If that icon is red and crossed out, the tool in your hand cannot break it.
The map has 137 Sulfur Boulder spots, and the heaviest cluster sits around Sonnenberg's Clinic, with 42 nearby. Rat Queen's Crossing follows with 16, and Horizon and the Solar Power Plant each have 5 close by. Another 64 spots lie out in the open, away from any named place, so you can also pick them up while crossing open ground. Sulfur goes into crafting Chemicals and Gunpowder.
Sonnenberg's Clinic
Rat Queen's Crossing
Horizon
Solar Power Plant
Shallow Rift
Landscar Cave
Chemicals
Gunpowder
Rock Boulder
Flint Boulder
Iron Boulder
Coal Boulder
Copper Boulder
Gold Boulder
Moonrock Boulder