Simple Kitchen Backsplash Ideas: Travertine Tile Installation?

lan to install 18X18 travertine as kitchen backsplash over existing sheetrock. Have some experience with ceramic tile in flooring and backsplash. Should I use thinset or mastic to bond the tiles to the sheetrock? For the bonding material recommended, what size trowel notch? How close can I install the tiles... show more lan to install 18X18 travertine as kitchen backsplash over existing sheetrock. Have some experience with ceramic tile in flooring and backsplash.

Should I use thinset or mastic to bond the tiles to the sheetrock?
For the bonding material recommended, what size trowel notch?
How close can I install the tiles to each other, i.e., how thin can I make the grout lines?
I suspect travertine is more fragile than ceramic. How much trouble will I have cutting openings for switches, etc? What is the best way to cut these openings?
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