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Franklinite

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.

"Franklinite," Microsoft® Encarta® Online Encyclopedia 2008
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