AM_Richterite_29 Formula: Si8 Mg5 (Ca1.2 Na.8) K1.6 O24 Name: Richterite Unit cell: 10.0209 18.001 5.273 90.0 104.786 90.0 , V=919.68 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: Kr80