AM_Ferrotschermakite
Formula: Na.23 K.14 Ca1.86 Mg1.22 Mn.02 Fe2.4 Ti.1 Al3.3 Si6 H1.98 O24
Name: Ferrotschermakite
Unit cell: 9.8179 18.106 5.3314 90.0 105.0 90.0 , V=915.43
Space group: C12/M1 (12)

Hawthorne F C , Grundy H D , Mineralogical Magazine , 39 (1973) p.36-48, The crystal chemistry of the amphiboles. I: Refinement of the crystal structure, of ferrotschermakite, Locality: Frood Mine, Sudbury, Ontario, Canada