AM_Parvowinchite Formula: Na1.168 K.03 Fe.72 Mg4.008 Li.06 Mn.948 Ca.388 Si7.88 Al.11 O23.6 F.4 H1.6 Name: Parvowinchite Unit cell: 9.704 17.99 5.297 90.0 103.51 90.0 , V=899.14 Space group: C12/M1 (12)

Oberti R , Ghose S , European Journal of Mineralogy , 5 (1993) p.1153-1160, Crystal-chemistry of a complex Mn-bearing alkali amphibole, ( tirodite ) on the verge of exsolution