AM_Montebrasite_2 Formula: P Al O4.706 F.294 Li H.706 Name: Montebrasite Unit cell: 6.6984 7.71 6.983 91.06 117.81 91.49 , V=318.68 Space group: C-1 (2)

Groat L A , Raudsepp M , Hawthorne F C , Ercit T S , Sherriff B L , Hartman J S , American Mineralogist , 75 (1990) p.992-1008, The amblygonite-montebrasite series: Characterization by single-crystal, structure refinement, infrared spectroscopy and multinuclear MAS-NMR, spectroscopy, sample A-2