AM_Manganocummingtonite Formula: Si7.872 Al.088 Fe.5 Mg3.7 Zn.749 Mn1.599 Ca.28 Na.21 O24 H2 Name: Manganocummingtonite Unit cell: 9.606 18.126 5.317 90.0 102.63 90.0 , V=903.39 Space group: C12/M1 (12)

Hawthorne F C , Grundy H D , The Canadian Mineralogist , 15 (1977) p.309-320, The crystal structure and site-chemistry of a zincian tirodite, by least-squares refinement of X-ray and mossbauer data