Fire proof adhesive failing on chimney breast

[WetSaw]

They look like porcelain tiles, have you got a picture of the back of one?

 

[Stuart L]

pdc
the "tile" is a polished sandstone I got from a company called mandarin stone. They don't appear to stock the polished version anymore just the tumbled.
Luckily I had some off cuts, photos show both sides of same tile.

 

[Stuart L]

Sorry should have said "polished limestone"...lol