Sandstone

Lore & Background

In the geological strata of the ONI world, Sandstone occupies a quiet, unassuming position in the upper crust. It formed from compacted sedimentary deposits long before the colony ship arrived, and it sits in broad, easily accessible veins near the surface. Duplicants who first break ground in the cross-section often find themselves surrounded by it, and it becomes the texture of their early days: the walls of their first living quarters, the floors of their first work area, the crude partitions between gas chambers.

What makes Sandstone memorable to the colony is not its strength or rarity but its ubiquity. It is the material of compromise. When a Duplicant needs a wall yesterday and the better stone is three biomes below, Sandstone is what gets placed. It cracks under heavy loads, it offers little thermal insulation, and it will not hold up a multi-level structure without reinforcement. Yet in the first hours of a colony, when oxygen is scarce and every Duplicant is still learning the ropes, that is enough.

Over the course of a long save, Sandstone tends to be replaced. Duplicants smelt, refine, and build with superior materials. The orange blocks get demolished, recycled, or simply buried under newer construction. But the first room a Duplicant ever built, the one with its rough sandstone walls and the faint smell of freshly broken rock, remains in the colony's memory as the place where survival began.

In Their Own Story

The mining laser hummed its low, steady note against the face of the rock, and the brownish-orange chips tumbled into the collection bin with a soft, granular clatter. Maren adjusted her grip on the tool and watched the next layer peel away, revealing the same warm, sandy grain as the last. Three meters of it. Four. The vein hadn't thinned yet.

"Copy that, base. Sandstone vein, upper shelf, running east. Plenty of it. We're good for a week of walls at least."

She wiped a smear of orange dust from her cheek and glanced down into the cross-section. Far below, the deeper biomes glowed with their own strange colors—veins of something metallic, pockets of gas that made her eyes water just looking at them. But up here, in the shallow crust, the world was simple. Rock you could break with a tool, air you could breathe, a colony that was still small enough to hold in your mind.

She placed the next block. It clicked into the wall with a satisfying, solid sound. Another meter of shelter, one more night the Duplicants wouldn't have to worry about the void pressing in. Sandstone. Not glamorous. Not strong. But it was here, and it was now, and the colony needed a wall before sunset.

Maren set down her tool, leaned against the fresh block, and watched the orange dust settle in the lamplight like slow, warm snow.

Reader's Guide

Sandstone occupies the upper biomes of the cross-section, typically within the first few layers below the colony's starting surface. It appears in broad, easily visible veins of brownish-orange solid blocks, making it one of the first resources any Duplicant will mine.

As a solid mineral, Sandstone has relatively low density compared to the denser rocks found in deeper strata. This makes it lighter and easier to work with, but it also means its structural integrity is on the lower end. Sandstone blocks can support basic single-layer walls and floors, but they are not ideal for multi-level construction or for bearing the weight of heavy machinery placed directly above them. For load-bearing structures, Duplicants should look to stronger materials in the mid and lower layers.

When mined, Sandstone yields blocks that can be placed directly as construction material: walls, floors, and structural supports. It does not require smelting or further processing, which makes it the fastest material to deploy in an emergency.

Hazards are minimal. Sandstone does not emit gases, does not ignite, and poses no toxic risk. The primary danger is structural: a poorly placed sandstone wall may give way under pressure differentials or the weight of stacked resources, potentially trapping a Duplicant or breaching a sealed room. In the early game, this is the main reason to reinforce sandstone structures with stronger materials as soon as they become available.

Did You Know?

• Sandstone is typically one of the first solid resources a new colony encounters, making it the default building material during the critical early-game phase when oxygen and power are still scarce.
• Its low structural integrity means it is generally unsuitable for supporting heavy multi-level constructions, so experienced players often treat it as a temporary or cosmetic material rather than a permanent foundation.
• Because it requires no smelting or processing, Sandstone can be mined and placed as a wall or floor in the same action, making it the fastest material to deploy in an emergency seal.
• In the cross-section's visual design, Sandstone's warm brownish-orange color contrasts with the cooler blues and greys of deeper mineral layers, giving players an intuitive visual cue for depth and material quality.