Montebrasite Groat L A, Chakoumakos B C, Brouwer D H, Hoffman C M, Fyfe C A, Morell H, Schultz A J American Mineralogist 88 (2003) 195-210 The amblygonite (LiAlPO4F) - montebrasite (LiAlPO4OH) solid solution: A combined powder and single-crystal neutron diffraction and solid-state Li MAS, CP MAS, and REDOR NMR study Sample: from Dunton Gem Min, Oxford County, Maine at T = 75 K _database_code_amcsd 0002957 6.7129 7.7095 7.0231 91.359 117.960 91.781 C-1 atom x y z occ Uiso P .9834 .3420 .2675 .0031 Al1 0 0 0 .0033 Al2 0 0 1/2 .0029 O1 -.3180 .0147 -.1610 .0045 O2 .2979 .0589 .5727 .0047 O3 .1024 -.2237 -.3900 .0042 O4 .0256 .2358 .1040 .0049 O .0490 .0896 -.2254 .95 .0044 F .0490 .0896 -.2254 .05 .0044 H .2063 .1336 .8480 .95 .017 Li1 .061 -.322 .309 .45 .000 Li2 .083 -.321 .322 .55 .018