The Collaborative International Dictionary
Jeffersonite
Jeffersonite \Jef"fer*son*ite\, n. [Named after Thomas Jefferson.] (Min.) A variety of pyroxene of olive-green color passing into brown. It contains zinc.
Wiktionary
jeffersonite
n. (context mineralogy English) A variety of pyroxene of olive-green color passing into brown. It contains zinc.
Wikipedia
Jeffersonite
Jeffersonite is a dark green pyroxene mineral, a manganese zinc enriched variety of augite (Ca(Mn,Zn,Fe)SiO), sometimes compared to aegirine. Jeffersonite is not a recognized mineral name.
It occurs in pegmatites where it can form crystals up to long and in the contact metamorphic zone between limestone and various intrusive rocks. It is reported from the Sterling Hill Mine, Franklin, New Jersey, in South Australia and Sweden.