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Webster 1828 Edition

Noun.

[from Hedenberg, who first analyzed it.]

A mineral, or ore of iron, in masses, composed of shining plates, which break into rhombic fragments; found at Tunaberg, in Sweden.

hedenbergite ‎(countable and uncountable, plural hedenbergites)

(mineralogy) The iron-rich endmember of the pyroxene group having a monoclinic crystal system.