I'm in the mid-west and have been using Type N mortar for almost all above ground stone work (walls, patios, etc.) I was randomly reading an article on mortar types and they were discussing that Type N is prepared by mixing Portland cement, Lime and Sand... I always use the Type N mortar mix, that I assumed was Portland & Lime, that I by in bags and mix with my bulk sand. I can't seem to find the ingredients for the Type N mix I use anywhere, even on their website. I was wondering if it is simply a Portland/lime mix or not. Let me know if you know! Thanks.