Popularity (1-4)
Displays on a scale of 1 to 4 how popular the mineral. (1 = Very popular - even non-mineral collectors are familiar with the mineral. 2 = Popular among mineral collectors; most mineral collectors know of the mineral. 3 = Somewhat abstract. Some mineral collectors don't know of the mineral. 4 = Abstract. Basically unheard of, in exception to a few mineral collectors and science professors.