- Crackstone is a mid-game resource found in deeper strata.
- Standard tools are ineffective; specific upgrades are required.
- Physics interactions can help break it indirectly.
- Automation is possible with late-game machinery.
- Exploration is key to finding natural cracks.
Understanding Crackstone Mechanics
Crackstone is a durable block type that serves as a significant barrier in Sandustry's mid-game progression. Unlike standard sand or soil, it resists basic excavation attempts, forcing players to upgrade their equipment or utilize the game's physics engine to bypass it. Found primarily in the Deep Strata, this material often guards valuable resources like Auralite Crystals or ancient Artifacts.
Attempting to mine Crackstone with basic tools is a waste of time. Ensure you have unlocked the appropriate technology or have a sufficient Energy supply before attempting to break it manually.
The block behaves uniquely under stress. While it has high impact resistance, it can crumble if subjected to specific environmental conditions or heavy machinery. Understanding these interactions is the difference between a stalled factory and a thriving late-game operation.
| Property | Description | Impact on Mining |
|---|---|---|
| Hardness | Extremely high | Requires Tier 3+ tools or explosives |
| Location | Deep Strata, Biomes | Requires long transport lines |
| Reaction | Brittle to Heat/Impact | Can be broken indirectly |
| Value | High (Guards Artifacts) | Critical for progression |
Locating Crackstone Deposits
Finding Crackstone is the first step. It rarely spawns on the surface; instead, it forms dense layers or specific geological features underground.
Descend to Lower Strata
Begin by digging past the initial soil and sand layers. Crackstone typically appears below the standard dirt depth, often marking the transition to more dangerous biomes.
Look for Visual Clues
Crackstone has a distinct dark, jagged texture compared to surrounding soil. Look for veins that sparkle slightly, indicating higher density or trapped resources inside.
Check Map Anomalies
If you have unlocked the Scanner technology, use it to identify hard materials. Large clusters of hard blocks usually signify a Crackstone formation.
Explore Side Caverns
Sometimes natural caves have exposed Crackstone. These are easier to attack from multiple angles than a solid wall you are digging into vertically.
Always carry a Water Bucket or Pipes when descending. Crackstone layers often hide Waterlogged Areas behind them. Breaking into a flooded chamber without drainage can drown your character or flood your factory.
Methods to Break Crackstone
There are three primary ways to breach Crackstone: manual upgrades, physics exploitation, and automated destruction.
Manual Mining
- Requires: Heavy Drill Upgrade
- Speed: Slow but consistent
- Cost: High Energy consumption
- Best for: Precision mining
Physics Breaking
- Requires: Liquids or falling debris
- Speed: Variable
- Cost: Low resource cost
- Best for: Natural terrain manipulation
Automated Mining
- Requires: Advanced Drones/Drills
- Speed: Fast (late game)
- Cost: High initial setup
- Best for: Mass production
1. The Heavy Drill Method
The most straightforward approach is unlocking the Heavy Drill technology in the tech tree. This tool increases your mining damage significantly.
- Prerequisites: Gold, Basic Factory, Energy Network.
- Execution: Simply hold the mining action on the Crackstone. It will take several seconds per block.
- Optimization: Ensure your Energy network is robust. The Heavy Drill drains power quickly; if your energy bar depletes, mining speed drops to near zero.
2. Physics and Heat Interactions
Sandustry's falling-sand engine allows for creative solutions. Crackstone is weak against Heat and Impact.
- Lava/Heat: If you can route Lava or a heat source near the Crackstone (without melting your own machines), the thermal stress can cause it to crumble over time.
- Falling Debris: Creating a controlled collapse of heavy rocks (not sand) onto Crackstone can damage it. This is risky and uncontrolled, but useful in a pinch.
3. Automated Destruction
Once you reach the Factory Promotion tier that unlocks Drones or Auto-Drills, you can set up automated Crackstone farms.
- Setup: Place Auto-Drills facing the Crackstone wall.
- Logistics: Use Conveyors to move the resulting debris away from the drill head to prevent jams.
- Power: These machines require a constant stream of Energy. Connect them directly to your main grid.
In the late game, combine Launchers to throw explosives at distant Crackstone walls. This allows you to mine without exposing your character to deep biome hazards.
Factory Integration and Automation
Breaking Crackstone is only half the battle; managing the flow of debris is the other half. Because Crackstone drops heavy chunks, it can easily clog standard conveyors designed for sand.
| Logistics Type | Efficiency | Risk Level | Recommended Use |
|---|---|---|---|
| Standard Conveyor | Low | High (Jams) | Not recommended |
| Heavy Conveyor | High | Low | Essential for Crackstone |
| Launcher System | Medium | Medium | Bypassing obstacles |
| Drone Transport | High | Low | Complex layouts |
Best Practices for Automation:
- Use Heavy Conveyors: Standard belts will stall under the weight of Crackstone chunks.
- Filter Early: Use Filters to separate Crackstone from any loose sand or dirt mixed in during the mining process.
- Storage: Build a dedicated Storage Silo. Crackstone is often used in late-game crafting or processed further into Auralite.
- Safety: If using heat-based breaking methods, ensure your water pipes are insulated. A burst pipe near a heat source can destroy your logistics line.
Crackstone Automation Setup:
- Unlock Heavy Conveyor technology
- Secure Energy supply for Auto-Drills
- Build drainage for hidden water pockets
- Set up Filters to separate debris
- Connect output to Storage or Processing
Progression and Rewards
Why go through the effort of breaking Crackstone? The rewards are essential for Factory Promotion and Achievements.
- Auralite Crystals: These are frequently found encased in Crackstone layers. They are the primary resource for Aura Extraction.
- Artifacts: Deep Crackstone caverns often house Ancient Artifacts needed for the "Artifact Collector" achievement.
- Space: Clearing Crackstone opens up massive underground caverns perfect for expanding your factory footprint without cluttering the surface.
Q: Can I break Crackstone with just a pickaxe?
No. The basic pickaxe deals zero damage to Crackstone. You must at least unlock the **Heavy Drill** or use explosives/physics to break it.
Q: Does water break Crackstone?
Water alone does not break it, but if you can freeze the water or use it to transport lava/explosives, it can be part of the process. It is mostly useful for draining the water *behind* the Crackstone.
Q: What is the fastest way to mine it?
Late-game **Auto-Drills** powered by a high-output **Energy** network are the fastest. For manual mining, the **Heavy Drill** is your only option.
Q: Is Crackstone renewable?
Currently, Crackstone is a finite resource generated in the world seed. Once a layer is mined, it does not respawn, making exploration for new deposits crucial.