AM_Richterite_30 Formula: Si8 Mg5 (Ca1.4 Na.6) K1.2 O24 Name: Richterite Unit cell: 9.9884 18.016 5.273 90.0 104.746 90.0 , V=917.63 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: Kr60