Black Eye Coffee and Yerba Mate Tea are produced all around the globe. And they change according to region in where they are cultivated. So, the question arises what is Black Eye Coffee and Yerba Mate Tea's differentiating factor?In following section we will take a close look at what is Black Eye Coffee and Yerba Mate Tea color, serving style, types and much more. First thing to know is what are the different types of Black Eye Coffee and Yerba Mate Tea. Well, Black Eye Coffee types include NA while types of Yerba Mate Tea are Mate, Green, Herbal.