The Biwabik Fe formation in the eastern Mesabi district, [Minnesota], the type locality for taconite, consists of interbedded strata of 2 fundamental or basic types, namely massive and thinly bedded. The most significant difference between the various taconite rock types is merely the relative abundance and mineralogy of these 2 types of strata. On this basis, 5 general groups of taconite are proposed. The assignment of a specific rock name to a given rock type, such that it clearly indicates the mineralogy and relative abundance of each of the 2 kinds of strata, is impossible by use of conventional classification methods. Consequently, a simple, although somewhat unorthodox, classification scheme is proposed and is illustrated.

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