VeinA channel through a body, a leaf, or a rock: the same branching used three ways.descriptionA vein is a path that carries. In flesh it is Blood. In a Leaf it is water and sugar. In rock it is Ore of Iron, Gold, or Copper filling a crack.Vein is not a type. It feeds Metal first, then Human and Tree, because the map already had the liquors and the organs and needed the shared plumbing.formchannelrelatedMetalHumanTreeOreBloodLeafIronGoldCopper