Hysterisis

[Musivarius]

I've always wondered some other mosaicists said that green marble is easier to cut when it was wet. Apparently it's where the water enters the stone and causes it to release any internal stress. On one website they said you have to set green marble with an epoxy.
Anyone come across this?

 

[Muse2k8]

Green marble is a nightmare lol.

 

[Topshop]

Green marble is actually serpentine (whole different stone). Most serps need to be brought up to a high grit hone 1800 or 3000 before using marble polishing powders or pastes to get the gloss up where as most marbles and calcite stones only require honing up to 400 or 800 grit. I am not aware of any stress in the stone.

 

[Musivarius]

Thanks for that info, there are a number of references to thermal hysteresis (in the bowing of external cladding) so I would have thought that the potential for stress within the stone is present in all types?

 

[Topshop]

It does make sense that on cladding there would be a temperature difference from inside to outside and we all know everything shrinks or expands with heat and cold but I never really thought of it on a floor being an issue. With cladding the stone is usually held away from direct contact with the building wall so air can come between the wall and stone. I have seen many bowed (cupped) slabs when cutting granite tops but usually it is from a resining process used to make the stone stronger or to fill natural pits.