Grout is a necessary and integral part of many tile jobs for several reasons.
Marble no grout lines.
In most other tile i will use 1 16 or 1 8 inch lines.
Marble tile no grout lines.
I have done two other baths in the past with the same material and both times we have had grout lines.
Grout works to prevent moisture and detritus from entering and getting stuck in the grout joints.
Laying a marble floor without grout is possible so long as proper care is taken to assure your layout is perfectly square.
The best thing to do is use the smallest grout line your particular tile will allow and get a grout that closely matches the tile.
This can kick up a lot of grout dust so make sure the area is well ventilated.
It keeps moisture out of the substrate helps keep tile lines straight and prevents tiles from rubbing against one.
I am redoing a master bath and we will be doing cararra marble.
Using a grout saw or an electric tool such as a dremel with an appropriate attachment begin to remove the grout from between the marble tiles.
As you work be very careful to avoid the edges of the tiles themselves as you do not want to chip or scratch them.
I have never heard of this before.
Before installing your marble tiles without grout consider the function of grout and whether it is appropriate to eliminate the step.
How to lay a marble floor without grout.
For most granite and marble tile i install i use either 1 32 or 1 16 inch grout lines.
I try to use the smallest grout lines the tile will allow.