AM_Richterite_32 Formula: Si8 Mg5 (Ca1.8 Na.2) K.4 O24 Name: Richterite Unit cell: 9.924 18.03 5.2749 90.0 104.67 90.0 , V=913.07 Space group: C12/M1 (12)

Hawthorne F C , Della Ventura G , Robert J-L , Welch M D , Jenkins D M , American Mineralogist , 82 (1997) p.708-716, A Rietveld and infrared study of synthetic amphiboles along the, potassium-richterite-tremolite join, Sample: Kr20, Note, Kr0 sample from Smelik et al (1994) Am Min 79, 1110-1122