Minecraft GeoStrata Mod [1.6.4/1.6.2/1.5.2]

GeoStrata is a small mod to diversify underground world generation, making mining and caves more interesting, while simultaneously adding many aesthetic and functional building materials.
Its basic premise is that it adds a bunch of real-world rock types which overwrite most (but not all)...
Minecraft GeoStrata Mod [1.6.4/1.6.2/1.5.2] - http://www.8minecraft.com/geostrata-mod/