AM_Hornblende_12 Formula: Si6.608 Al1.702 Mg4.14 Fe.35 Ti.06 Cr.22 Ca1.92 Na.533 K.17 H2 O24 Name: Hornblende Unit cell: 9.886 18.009 5.291 90.0 105.24 90.0 , V=908.87 Space group: C12/M1 (12)

Oberti R , Hawthorne F C , Ungaretti L , Cannillo E , The Canadian Mineralogist , 33 (1995) p.867-878, [6]Al disorder in amphiboles from mantle peridotites, Sample: F13