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Webster 1913 Edition

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Noun.

[Gr. [GREEK] flame-colored, fr. [GREEK] fire.]

(Min.)

A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also

magnetic pyrites

Pyrrhotite

pyrrhotite ‎(usually uncountable, plural pyrrhotites)