AM_Clinopyribole Formula: Mg5.84 Al1.22 Ca1.52 Na2.32 Si12 O36 K1.1 H2 Name: Clinopyribole Unit cell: 9.839 26.6471 5.2665 90.0 106.25 90.0 , V=1325.61 Space group: A12/M1 (12)

Yang H , Konzett J , Prewitt C T , American Mineralogist , 86 (2001) p.1261-1266, Crystal structure of a new (21)-clinopyribole synthesized at high temperature and pressure