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Webster 1913 Edition

Noun.

[Gr. [GREEK] an imitator. So called because it resembles pyromorphite.]

(Min.)

A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.

mimetite ‎(countable and uncountable, plural mimetites)

(mineralogy) An arsenate mineral which forms in lead deposits, usually by the oxidation of galena and arsenopyrite.