Stone
Stone is a fixed block of grey rock that ignores heat entirely and gives way only to acid.
- Movement
- Solid — stays where you paint it
- Weight
- 8 / 9 (heavier sinks through lighter)
- Lifetime
- Permanent
- Glow
- None
Stone never moves once painted. It is static, so it does not fall even with nothing underneath it, and no powder or liquid can push it aside. Its listed weight of 8 is mostly bookkeeping for that reason: the simulation compares weights only between cells that are able to move, and stone never is. A slab painted in mid-air hangs there for the whole session and holds up whatever lands on it.
Heat leaves it alone. Neither fire nor lava has an entry for stone, so a lava channel lined with it or a fireplace built from it will still be standing afterwards. The single material that removes stone is acid, which deletes a touching stone cell 15 percent of the time it checks that contact. That is the slowest of acid’s three bites; wood and metal both go faster.
Stone is also something the sandbox produces by itself. When water touches lava, the lava cell becomes stone and the water becomes steam; when ice touches lava, the lava again turns into stone and the ice melts into water. Because the new stone is static, it sets exactly where the molten cell was, so a cooled flow keeps its outline as a rocky crust instead of slumping into a heap.
Real basalt forms the same way in broad strokes: molten rock loses heat to water or air and solidifies. Sandlab skips everything gradual about it. There is no temperature, no glowing half-cooled skin and no cracking; a lava cell is either fully molten or, after one successful contact roll, fully stone.
Try it yourself
- Freeze a lava river in place. Paint a long strip of lava on a stone floor, then drag a thin line of water across its surface. Wherever the two meet, steam lifts off and grey rock appears. Keep sweeping and the river turns into a ridged stone bar that still traces the shape of the flow.
- Acid against a stone dam. Build a stone dam two or three cells thick with a pool of acid on one side and open space on the other. The acid chews into the dam a cell at a time; once it breaks through, the remaining acid drains out of the hole. Double the thickness and the breach takes noticeably longer.
- A shelf with nothing under it. Paint a horizontal bar of stone high above the floor and pour sand onto its middle. A cone builds on the bar and grains spill off both ends, yet the bar itself never drops, because static materials ignore gravity here.
Reactions
Odds are per contact check: each tick, touching cells inside the same two-by-two block are checked against the reaction table, so even a small chance happens soon after contact.
When something touches stone
- Touching Acid: this Stone dissolves away. (steady, 15% per contact check) →
Tip
For a floor that must survive fire and lava but might need an opening later, pick stone over wall. A small pocket of acid can cut stone, while wall can only be removed by hand.