Magnesioferrite

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Magnesioferrite is a magnesium iron oxide mineral, a member of the magnetite (q.v.) series of spinels. Magnesioferrite crystallizes the black metallic octahedral crystals. It is named after its chemical composition of magnesium and ferric iron. The density is 4.6 - 4.7, Average = 4.65 and the diaphaniety is opaque. Crystalline - Fine - Occurs as well-formed fine sized crystals. Massive - Granular - Common texture observed in granite and other igneous rock. It's hardness is 6-6.5 - Orthoclase-Pyrite and the luminescence is non-fluorescent. It's luster is metallic and it's streak is dark red. It's from Vesuvius and Stromboli, Italy.

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