AM_Montebrasite_3 Formula: P Al O4.567 (F.433 Li) H.567 Name: Montebrasite Unit cell: 6.6837 7.708 6.9671 90.94 117.75 91.36 , V=317.41 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-1