This is a common problem with certain serpentines.  They hate water.  It can be random as well. It could also be what the stone is set on. I would tear it out and replace it.

On Fri, Feb 2, 2018 at 7:55 PM, Tony Deluna <> wrote:
Hey pros,
does anyone know what causes spalling on green marble? The picture below is right outside the shower.
 Big chunks have popped out.
There are no problems with spalling on the shower floor serpentine tiles.

The tub face slab has a lot of spalling too,  but it’s outside and away from the shower.

What are you think?

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Tony DeLuna

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