Underground Biomes Mod — Guide
Stone Types and Statistics
The mod adds 24 stone types, each with its own physical properties. Igneous rocks are generally the hardest to mine, while Sedimentary rocks are the softest and often contain unique resources like fossils.
Igneous Rocks
Formed from solidified magma, these are the toughest stones in the mod.
| Stone Type | Hardness | Blast Resistance |
|---|---|---|
| Red Granite | 1.5x | 40.5 |
| Black Granite | 1.4x | 39.3 |
| Rhyolite | 1.1x | 33.3 |
| Andesite | 1.2x | 36.0 |
| Gabbro | 0.8x | 21.0 |
| Basalt | 1.2x | 36.0 |
| Komatiite | 1.3x | 37.8 |
| Dacite | 1.0x | 30.0 |
Metamorphic Rocks
Rocks transformed by heat and pressure. They often appear in striking colors.
| Stone Type | Hardness | Blast Resistance |
|---|---|---|
| Gneiss | 1.1x | 33.3 |
| Eclogite | 1.0x | 15.0 |
| Marble | 1.1x | 33.3 |
| Quartzite | 1.3x | 37.8 |
| Blue Schist | 0.7x | 16.2 |
| Green Schist | 0.7x | 16.2 |
| Soapstone | 0.4x | 6.0 |
| Migmatite | 0.9x | 25.8 |
Sedimentary Rocks
Formed from compressed layers of sediment. These stones do not produce cobblestone when broken; they either drop themselves or specific items.
| Stone Type | Hardness | Blast Resistance |
|---|---|---|
| Limestone | 0.5x | 8.7 |
| Chalk | 0.5x | 8.7 |
| Shale | 0.5x | 8.7 |
| Siltstone | 0.6x | 12.0 |
| Lignite | 0.5x | 8.7 |
| Dolomite | 0.5x | 8.7 |
| Greywacke | 1.0x | 30.0 |
| Chert | 0.9x | 25.8 |
Mechanics
Underground Biomes and Strata
The mod generates "Underground Biomes" which are large regions defined by a primary stone type. Within these biomes, the stone is organized into Strata—horizontal layers of different rocks. This means as you mine deeper, you will pass through distinct bands of color and material.
Ore Overlays (UBification)
To maintain immersion, the mod uses an overlay system for ores. When an ore generates within a UB stone, it adopts the texture of that stone.
- Vanilla Support: Coal, Iron, Gold, Redstone, Lapis, Diamond, and Emerald all have UB-textured variants.
- Mod Support: Many popular mods (like IndustrialCraft, Thaumcraft, and Thermal Expansion) are supported natively or through the UB API, allowing their ores to blend into the environment.