/fill and Diorite, Granite, etc.

When using the /fill command and having diorite as the TileName it doesn't work and states "There is no such item with ID diorite". The same works for granite, podzol, and andesite. Note: Here is the syntax I am using in case it is needed, for x y and z I use absolute coordinates, not relative. '/fill <x1> <y1> <z1> <x2> <y2> <z2> diorite 6 replace'