A preliminary report on an iron-rich formation near Raahe in the Gulf of Bothnia, Finland

In the Gulf of Bothnia, W of Raahe, there is an iron-rich formation which consists of two portions: an upper oxidized and a lower unoxidized portion. An average sample of the latter contains 35.9 percent Fe. About one half of this iron is included in magnetite, the rest enters into iron-rich clinoamphiboles, clinopyroxene and fayalite. As main minerals the oxidized portion contains iron-rich clinoamphiboles, iron-rich vermiculites and magnetite. FIG. 1. Map showing the location of the iron-rich formation (X) west of Raahe.