What is another word for calc-tufa?
Pronunciation: [kˈalktjˈuːfə] (IPA) 
Calc-tufa is a geological term referring to a type of limestone that forms from the precipitation of calcium carbonate. There are several synonyms for this term, including travertine, onyx marble, and alabaster. Travertine is a type of calc-tufa that is known for its smooth and porous texture, and is often used in construction and decor. Onyx marble is similar in composition to travertine but is usually black or dark in color, and is also used for decorative purposes. Alabaster is a more translucent version of calc-tufa and is often used for carving sculptures and other ornamental objects. Overall, these synonyms demonstrate the versatility and usefulness of this unique type of limestone.
