Marble is a block added by Artifice.
Marble can be harvested like stone. It is found like gravel and dirt patches and may intersect one of these. When broken, it drops Marble Cobblestone. The cobblestone needs to be smelted to turn back into marble.
It is the base of all Artifice's marble blocks.
In game description: Metamorphic stone Filled with interesting patterns
Marble can be crafted into Marble Brick.