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Magma
SuperStarSonicAdds volcanoes, lava vents and new magma blocks
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Nether
PilzAdamAdds a deep underground realm with different mapgen that you can reach with obsidian portals.
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Underground Survival Lighting
ArkatronIf you like underground light in survival, use this mod, it can help that.
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Geodes
AwesomeDragon97Adds amethyst geodes and an API for making custom geodes.
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Amethyst
alerikaisatteraAmethyst, basalt, calcite and related building blocks
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Technic Plus Beta
mt-modsThe technic modpack extends the Minetest game with many new elements, mainly constructable machines and tools.
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Randungeon
Phiiadds highly randomized vivid dungeons to the world, and tools to spawn/customize them.
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Ore Deposits
TarruviAdds ore deposits that can randomly spawn on stone
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Plantlife
mt-modsAdds various kinds of plants, fruit bushes, fallen trees, and a whole host of foliage and other ground cover.
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Winuser Leafdecay
LiilWith this additiona leaf decay, all trees in naturalbiomes, livingdesert, livingjungle and livingfloatlands have a working leafdecay function.
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Fly-B-Gone!
Hugues RossHides butterflies/fireflies
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More Trees!
mt-modsAdds a whole bunch of new types of trees, some bearing fruit or similar
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Too many ores
TeufloVThis adds 53 new ores. But most of them are useless.
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Badlands
AwesomeDragon97Adds the badlands biome, which contains plentiful clay and gold.
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Sedimentology
sofarA mod that adds realistic erosion and degradation of rocks.
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Loose Rocks
eduardomezencioAdds loose rocks which generate randomly on the surface.