Rainbow Calcite and Striped Travertine ("Onyx")
Rainbow Calicite and Striped Travertine cut quickly and produce interesting
stones. Travertine is often incorrectly called onyx, but it is not
a true onyx, which is a form of chalcedony. These materials may have
fractures, but usually they don't cause problems when cutting. Polishing
calcite and travertine is quick if you add a little vinegar to tin
oxide. Green rouge (also known as Zam) provides a fine polish as well.
Example of Rainbow Calcite Cab