Overview

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Jacobsite is a manganese iron oxide mineral. It is in the spinel group and forms a solid solution series with magnetite. The chemical formula is MnFe2O4 or with oxidation states and substitutions: (Mn2+,Fe2+,Mg)(Fe3+,Mn3+)2O4. It occurs as a primary phase or as alteration of other manganese minerals during metamorphism of manganese deposits. Typical associated minerals include hausmannite, galaxite, braunite, pyrolusite, coronadite, hematite and magnetite. It was first described in 1869 and named for the Jakobsberg Mine, Nordmark, Filipstad, Varmland, Sweden.

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