Hard to see from the picture but it looks like a symptoms of butt-joint intall and the grout is sitting in the tile bevel and there is not enough space between tiles for expansion so when temperature and moisture changes stone edges pressing together and edge is blistering off. i think there is also a little of pinkish color around which means moisture. This limestone is very soft to begin with so it crumbles like a cookie.

On Wed, Jul 5, 2017 at 5:21 PM, Fred Hueston <fhueston@gmail.com> wrote:

yes I have seen this lots of times. as I tell all my students to check the following and get back to me

1. is the tile hollow?
2. is the tile loose?
3. is there moisture present?
4. How is the tile set?
5. Is it slab on grade?
On Wed, Jul 5, 2017 at 5:16 PM, <daci6537@comcast.net> wrote:
Has anyone ever seen this before? The floor is only a year old.
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Frederick M. Hueston
www.stoneforensics.com
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Stone Inspection and Troubleshooting seminar Jan 29-Feb 1, 2018 Las Vegas
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Regards,

Rockland Stone Restoration
845-323-7333
www.rocklandstonerestoration.com