AM_Richterite_12
Formula: O23.6 (F.4 Si7.44) Ti.56 Mg5 (Na Ca) K H1.6
Name: Richterite
Unit cell: 10.0613 18.0314 5.2963 90.0 104.896 90.0 , V=928.56
Space group: C12/M1 (12)

Della Ventura G , Robert J-L , Beny J-M , Raudsepp M , Hawthorne F C , American Mineralogist , 78 (1993) p.980-987, The OH-F substitution in Ti-rich potassium richterite: Rietveld structure, refinement and FTIR and micro-Raman spectroscopic studies of synthetic, amphiboles in the system K2O-Na2O-CaO-MgO-SiO2-TiO2-H2O-HF, Sample Rich59, Atomic parameters from ICSD