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Black Iron oxide is FeO in glaze chem, Fe3O4 in the bag.  Hamada expressed a preference for blacksmith scale and that is proper FeO.

Hematite:  Fe2O3

Wustite:  FeO

Magnetite:  FeO.Fe2O3/ Fe3O4  —  a crystal (spinel) of FeO and Fe2O3.  

Metallic iron is just Fe.

Yellow iron oxide:  FeO(OH).nH2O


Edited by Tyler Miller

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