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FRANKLINITE (Zinc Iron Manganese Oxide)
Franklinite is one of the minerals found at Franklin, New Jersey, a world famous locality that has produced many formerly unknown and exotic mineral species.
Franklinite
Franklinite. Franklinite (Zinc iron oxide, with large amounts manganese) (Zn,Mn 2 +)(Fe 3 +,Mn 3+) 2 o 4. The red ore, which is a nick name for Franklinite, was thought to be ...
Franklinite
Classic 1935 monograph by Charles Palache on the minerals of Franklin and Sterling Hill, New Jersey. Published by the USGS as Professional Paper 180.

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Franklinite

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Franklinite, mineral containing the oxides of iron, manganese, and zinc, with the formula (Fe, Zn, Mn)(Fe, Mn)₂O₄. It crystallizes in the cubic system (see Crystal) and occurs chiefly as octahedral crystals. It also occurs as rounded grains and compact masses. It is slightly magnetic, opaque, iron black in color, and has a metallic luster. Its specific gravity ranges from 5.07 to 5.22 and its hardness from 5.5 to 6.5. In the U.S. it occurs in considerable quantity in Franklin and Ogdensburg, New Jersey.