AM_Epistolite Formula: Nb2.12 Fe.04 Ti1.04 Na3.79 Ca.27 Mn.04 Si4.4 O22 H10 Name: Epistolite Unit cell: 5.46 7.17 12.041 103.63 96.01 89.98 , V=455.45 Space group: P-1 (2)

Sokolova E V , Hawthorne F C , The Canadian Mineralogist , 42 (2004) p.797-806, The crystal chemistry of epistolite