This Mod From Blocks From vanilla Minecraft naturally spawns Underground Some are Very Rare though. The Blocks That spawn are Glass, coal, bone, clay, diamond, emerald, ender bricks, gold, lapis, magma, mossy stone, obsidian, prismerene, Quartz, Slime, sponge, Moster stone and glass. They All Spawn Underground. Hope You Enjoy it. Some Stuff Like Emerald has a 50 out of a 1,000,000 chance of spawning so it's pretty rare.http://www.themodcity.com/
