Formula: (Na,Ca)2(Mn,Fe)(Zr,Ti)(Si2O7)(O,OH,F)2 MONOCLINIC
Description: Lavenite is a very rare mineral found in low silica pegmatitic igneous rocks.
MARATHON COUNTY: Lavenite reportedly occurs in nepheline syenite in a quarry and nearby outcrop in the NE sec. 27 T.29N. R.6E. (Weidman, 1907; Vickers, 1956).