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Webster 1913 Edition

Noun.

[From

Willem

I., king of the Netherlands.]

(Min.)

A silicate of zinc, usually occurring massive and of a greenish yellow color, also in reddish crystals (troostite) containing manganese.

Willemite

willemite ‎(countable and uncountable, plural willemites)

(mineralogy) A rare mineral, zinc silicate, Zn₂Si O₄, that is a minor ore of zinc.

willemite f ‎(plural willemiti)