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Badlands
AwesomeDragon97Adds the badlands biome, which contains plentiful clay and gold.
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Wilhelmines Living Floatlands
LiilAdds various prehistoric animals to your Floatland Zone, if you are using V7 Map Generator.
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Too many ores
TeufloVThis adds 53 new ores. But most of them are useless.
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Sedimentology
sofarA mod that adds realistic erosion and degradation of rocks.
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Geodes
AwesomeDragon97Adds amethyst geodes and an API for making custom geodes.
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Loose Rocks
eduardomezencioAdds loose rocks which generate randomly on the surface.
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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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More Trees!
mt-modsAdds a whole bunch of new types of trees, some bearing fruit or similar
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Noriel Sylvire's Minerals Core Modpack
Noriel_SylvireAn API for automatically registering recipes, nodes and ore generation.
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Pyramids (with treasures)
WuzzyPyramids with treasures!
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Ocean
StarNinjasAdds coral reefs, fish, decorative ocean blocks and much more!
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Nether
Hybrid DogThe underworld for Minetest.
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Cloud Items
Panquesito7Powerful cloud tools.
Warning: Non-free media.
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Lapis Lazuli
LNJAdds lapis lazuli ore, items and blocks.
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Meze
CalinouA special ore that kills you when mined.
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Spawn redo
cathaya7d4Drop-in replacement for default/spawn for more third-party biomes