AM_Johninnesite Formula: Na2 Mn11 Mg5 As2 Si12 O50 H8 Name: Johninnesite Unit cell: 10.485 11.065 9.654 107.11 81.17 111.86 , V=992.26 Space group: P-1 (2)

Grice J D , Dunn P J , American Mineralogist , 79 (1994) p.991-995, Johninnesite: Crystal-structure determination and its relationship to other, arsenosilicates