Montebrasite Groat L A, Raudsepp M, Hawthorne F C, Ercit T S, Sherriff B L, Hartman J S American Mineralogist 75 (1990) 992-1008 The amblygonite-montebrasite series: Characterization by single-crystal structure refinement, infrared spectroscopy and multinuclear MAS-NMR spectroscopy sample AF-47 _database_code_amcsd 0001320 6.713 7.708 7.0194 91.31 117.93 91.77 C-1 atom x y z Uiso P -.01605 .34212 .26653 .0041 Al1 0 0 0 .0048 Al2 0 0 .5 .0046 O1 -.3172 .0154 -.1592 .0066 O2 .2981 .0581 .5743 .0065 O3 .1013 -.2234 -.3897 .0063 O4 .0265 .2362 .1035 .0076 Oh .0471 .0890 -.2265 .0059 Li .0696 -.3202 .3101 .0172 H .183 .129 .848 .0100