AM_Potassic-ferri-ferrorichterite_1
Formula: K Ca.57 Na1.37 Fe5.06 Si8 O24 H2
Name: Potassic-ferri-ferrorichterite
Unit cell: 10.1306 18.1678 5.2889 90.0 104.54 90.0 , V=942.25
Space group: C12/M1 (12)

Redhammer G J , Roth G , European Journal of Mineralogy , 14 (2002) p.105-114, Crystal structure and Mossbauer spectroscopy of the synthetic amphibole, potassic-ferri-ferrorichterite at 298 K and low temperatures (80-110 K), Sample: Ri1, T = 110 K