Sascab (Saskab) (from Mayan: Sajkab or saskab) is the term of Mayan origin that is used in the Yucatan Peninsula to refer to the material used to prepare mixtures for construction. It is a flimsy calcareous rock, described as "decomposed limestone", "breccia", or "lime mixture used by the Mayans". The abundant deposits of this material in Yucatán are called Saskaberas.[1]​.

It was used in construction as a mortar to replace lime, since it could be used without the need to calcine it in ovens, and in the construction of the famous roads that linked the Mayan cities of ancient times: the sacbeob (plural of sacbé) (white roads) in the Mayan civilization of Mesoamerica.

In ceramics the term is also applied to mixtures (with clay and water) of the finely crushed material.

According to the writer Jeanine Kitchel"), the explorer Edward Herbert Thompson found quarries near Chichén Itzá with worked sascab veins at the beginning of the century.

Currently, "sascab" is used as filling material in buildings and embankments. When finely ground it is called "stone powder" to replace sand in mortars. The fine particles obtained from sifting it are used to prepare putties for stucco.