Marble: Is a metamorphic rock formed by the alteration under
pressure of limestone or dolomite. Often irregularly colored
by impurities, marble is used especially in architecture and
sculpture.
Travertine: Is a massed form of calcium carbonate that results
from deposition by ancient springs or rivers. It is often beautifully
colored and banded as a result of the opportune presence of iron
and compounds or other impurities at various stages of deposition.
As a result you will have the most environmentally safe, durable
product and affordable in the market place.