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Hardness Of Navada Iron Ore

Magnetite, also called lodestone, or magnetic iron ore, iron oxide mineral fefe 2 o 4, or fe 3 o 4 that is the chief member of one of the series of the spinel q.V.Group.Minerals in this series form black to brownish, metallic, moderately hard octahedrons and masses in igneous and metamorphic rocks and in granite pegmatites, stony.

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