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The Collaborative International Dictionary
Plumosite

Plumosite \Plu"mo*site\, n. (Min.) Same as Jamesonite.

Wiktionary
plumosite

n. (context mineralogy English) jamesonite.

Wikipedia
Plumosite

Plumosite can refer to any feather ore, i.e. any ore that forms fine capillaries within the surrounding rock.

Generally it is a synonym for either Boulangerite, Jamesonite or Zinkenite.

Category:Mineralogy