AM_Montebrasite_4 Formula: P Al O4.5 (F.5 Li) H.5 Name: Montebrasite Unit cell: 6.6782 7.7159 6.949 90.82 117.66 91.22 , V=316.96 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 AF-46