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Stone is mined from grey rock nodes with a pickaxe, jackhammer, or any melee tool in a pinch — there's no crafting recipe for it, it's a pure gathering resource.

Mining tools matter a lot here

A Stone Hatchet or rock gets you through the early game, but a proper Pickaxe roughly doubles your gather rate, and a Jackhammer (fuel-powered) is faster still for a dedicated mining trip. If you're building a stone base, the tool upgrade pays for itself almost immediately.

Where to look

Grey rock formations anywhere on the map work, but large ore-rich rock clusters (often near mountains) let you mine a lot of stone without relocating every few nodes. Quarries and Excavators can also produce stone passively if you've got one running, though they're a bigger investment than just mining by hand.

What it's actually for

Stone is the resource behind stone-tier building upgrades, and it's cheap enough that most players out-gather their stone needs without trying — the real bottleneck for a stone base is usually wood and metal fragments, not stone itself.