Citation: Della Ventura, G.; Robert, J.-L.; Beny, J.-M.; Raudsepp, M.; Hawthorne, F. C. (1993). 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. American Mineralogist, 78, pp. 980-987.
Formula: Ca F0.4 H1.6 K Mg5 Na O23.6 Si7.44 Ti0.56