[Ron6519]

They sell a thinset specific to marble use. As for the Versabond, check the bag's instructions.
Ron

 

[Bud Cline]

Can I use VersaBond as well?

Yes.
A white thinset may be preferable.

 

[sukhenkoi]

Thanks.

I use white VersaBond Thin-Set Mortar for floor tiles.

 

[sukhenkoi]

I got the 4 x 24 Marble Threshold from HD. I got white VersaBond there as well. I asked HD guys what can I use to put the Threshold on Durock and they told me to use the same VersaBond.