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Underground Biomes has a bug or two resulting in some missing textures. This issue is in UBC 1.12-1.3.7 - later versions will hopefully fix it. You should be able to use this texturepack fix on top of any seperate texturepack for UBC as well, as it is only supplying missing overlays. This adds them for these mods:
MysticalWorld (requires this texturepack plus the json changing)
Thermal Foundation (requires just this texturepack)
Pyrotech (does not require this texturepack - just requires the json changing)
Instructions:
1) Edit this file in your installation using notepad: config/undergroundbiomes/ores/mysticalworld.json
Where you see undergroundbiomes:undergroundbiomes: replace with just undergroundbiomes:
2) Edit this file in your installation using notepad: config/undergroundbiomes/ores/pyrotech.json
Where you see undergroundbiomes:blocks/overlays/byg/dense_coal_ore replace with undergroundbiomes:blocks/overlays/pyrotech/dense_coal_ore
3) Apply the texturepack UBCTextureFix x.x.zip
As always, apply the texture pack in the order of precedence you need for your textures.
If you need more missing textures adding, from any other mods, just ask and I'll add them to this fix.