Mortar is a mixture of Portland cement and sand which is useful for bedding masonry units including concrete block, brick, and stone. Conventional mortar also includes lime, that makes the mortar stickier, so it stays within the finishes of each brick or block mainly because it’s currently being put. Mortars https://www.whofish.org/Default.aspx?tabid=45&modid=379&action=detail&itemid=284671&rCode=33