AM_Althausite Formula: Mg4 P2 O8.56 F.25 H.37 Name: Althausite Unit cell: 8.258 6.054 14.383 90.0 90.0 90.0 , V=719.06 Space group: PNMA (62)

Romming C , Raade G , American Mineralogist , 65 (1980) p.488-498, The crystal structure of althausite, Mg4(PO4)2(OH,O)(F, )