1) Calcium mineral 2) Iron mineral 
Jeffersonite is a dark green pyroxene mineral, a manganese zinc enriched variety of augite (Ca(Mn,Zn,Fe)Si2O6), sometimes compared to aegirine. Jeffersonite is not a recognized mineral name. It occurs in pegmatites where it can form crystals up to 30 cm long and in the contact metamorphic zone between limestone and various intrusive rocks. It is r...
• (n.) A variety of pyroxene of olive-green color passing into brown. It contains zinc.
Jef'fer·son·ite noun [ Named after Thomas Jefferson .] (Min.) A variety of pyroxene of olive-green color passing into brown. It contains zinc. 
Jeffersonite, named after Thomas Jefferson, is a variety of pyroxene of olive-green colour passing into brown. It contains zinc.