franklinite

(fraŋk′lin īt′)

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noun

a dark-colored, hard, very heavy, magnetic mineral, zinc manganese iron oxide, (Zn,Fe,Mn) (Fe,Mn)O, an ore of zinc and manganese

Origin: after Franklin, N.J., where found

See franklinite in American Heritage Dictionary 4

noun

A black, slightly magnetic mineral of zinc, iron, and manganese, ZnFe₂O₄, that is a valuable source of zinc.

Origin:

Origin: After Franklin, a borough of northern New Jersey

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