Why marble wastes so much more than tile
A tile is manufactured. Every one is identical, so a cut piece from one box can be used anywhere.
Marble is cut from a block of stone. The veining runs in a direction through the slab, and it changes as you move across it.
That means a piece cut from one part of a slab does not look like a piece from another part. You cannot simply use whatever offcut is nearest.
If the veining is meant to run continuously across a floor, or to mirror across a counter, the pieces have to come from specific places in specific slabs. Everything else is waste.
That is why twenty five per cent is normal and forty per cent is realistic for vein matched work, against ten or twelve for tile.
