AM_Howieite Formula: Si11.92 Ti.08 Fe8 Mn2.98 Mg.45 Al.62 Na O44 Name: Howieite Unit cell: 10.17 9.774 9.589 91.22 70.76 108.09 , V=851.95 Space group: P-1 (2)

Wenk H R , American Mineralogist , 59 (1974) p.86-97, Howieite, a new type of chain silicate