Jeffersonite n. : A variety of pyroxene of olive-green color passing into brown. It contains zinc.

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Taxonomy
Jeffersonite, free encyclopedia, search, mineral, mineral name, dark green, manganese zinc, Zn, Si2O6, crystals, borosilicate, Personal tools, Interaction, Toolbox, non-profit organization, silicate mineral, Manganese minerals, Iron minerals.

Defination from the web:
Jeffersonite is a dark green pyroxene mineral, a manganese zinc enriched variety of augite (Ca(Mn,Zn,Fe)Si2O6), sometimes compared to aegirine. ... Retrieved from "http://en.wikipedia.org/wiki/Jeffersonite" ...