Peprossiite-(Ce) Callegari A, Caucia F, Mazzi F, Oberti R, Ottolini L, Ungaretti L American Mineralogist 85 (2000) 586-593 The crystal structure of peprossiite-(Ce), and anhydrous REE and Al mica-like borate with square-pyramidal coordination for Al Sample: Pep2 _database_code_amcsd 0002425 4.596 4.596 9.309 90 90 120 P-62m atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) LaM2 0 0 0 .785 .0084 .0084 .0086 .0042 0 0 ThM2 0 0 0 .215 .0084 .0084 .0086 .0042 0 0 AlM1 .3889 0 .5 2/3 .0056 .0044 .0096 .0022 0 0 BT 1/3 2/3 .2196 .0052 .0052 .0082 .0026 0 0 O1 1/3 2/3 .3744 .0090 .0090 .0078 .0045 0 0 O2 .4180 0 .1592 .0101 .0034 .0149 .0017 -.0020 0 O3 0 0 .5 2/3 .0030 .0030 .0141 .0015 0 0