Formula: (Mg,Fe,Ca)(Mg,Fe)Si2O6 Monoclinic
Pigeonite is a member of the pyroxene group found generally as small grains in gabbros, basalts, andesites, dacites and hornfels. It occurs with plagioclase and augite, and is difficult to identify. It is probably more common in the state than indicated by the reported locality.
ASHLAND COUNTY: Pigeonite occurs as tiny grains in hornfels of the Ironwood iron formation in contact with the Mellen gabbro seen in outcrop in the SE NE sec. 14 T.44N. R.4W. It is associated here with fayalite, ferroaugite, orthopyroxene, magnetite and grunerite (Laybourn, 1979).