AM_Pigeonite_29
Formula: Mg.915 Fe.852 Ca.19 Mn.029 Na.003 Ti.01 Si1.984 Al.016 O6
Name: Pigeonite
Unit cell: 9.7096 8.9413 5.2473 90.0 108.515 90.0 , V=431.97
Space group: P121/C1 (14)

Domeneghetti M C , Zema M , Tazzoli V , American Mineralogist , 90 (2005) p.1816-1823