data_global _chemical_name_mineral 'Friedrichbeckeite' loop_ _publ_author_name 'Lengauer C L' 'Hrauda N' 'Kolitsch U' 'Krickl R' 'Tillmanns E' _journal_name_full 'Mineralogy and Petrology' _journal_volume 96 _journal_year 2009 _journal_page_first 221 _journal_page_last 232 _publ_section_title ; Friedrichbeckeite, K(_0.5Na0.5)2(Mg0.8Mn0.1Fe0.1)2(Be0.6Mg0.4)3[Si12O30], a new milarite-type mineral from the Bellerberg volcano, Eifel area, Germany ; _database_code_amcsd 0014649 _chemical_compound_source 'Bellerberg volcano, Eifel area, Germany' _chemical_formula_sum 'K.926 Na.772 Mg2.793 Mn.386 Be1.821 Si12 O30' _cell_length_a 9.970 _cell_length_b 9.970 _cell_length_c 14.130 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1216.363 _exptl_crystal_density_diffrn 2.666 _symmetry_space_group_name_H-M 'P 6/m c c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x,x-y,1/2-z' '-x+y,-x,-z' 'x-y,x,z' '-y,-x,1/2+z' 'y,x,1/2-z' 'y,-x+y,-z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x+y,y,1/2-z' 'x,y,-z' '-x,-y,z' 'x,x-y,1/2+z' '-x,-x+y,1/2-z' 'x-y,x,-z' '-x+y,-x,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,x-y,-z' 'y,-x+y,z' '-x+y,y,1/2+z' 'x-y,-y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv KC 0.00000 0.00000 0.25000 0.92600 0.02650 NaB 0.33333 0.66667 0.02040 0.19300 0.03000 MgA 0.33333 0.66667 0.25000 0.80700 0.01600 MnA 0.33333 0.66667 0.25000 0.19300 0.01600 BeT2 0.50000 0.00000 0.25000 0.60700 0.01140 MgT2 0.50000 0.00000 0.25000 0.39300 0.01140 SiT1 0.10056 0.35367 0.10910 1.00000 0.01230 O1 0.11900 0.40850 0.00000 1.00000 0.02940 O2 0.21070 0.28140 0.12840 1.00000 0.02990 O3 0.13530 0.49180 0.17900 1.00000 0.02220 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 KC 0.02420 0.02420 0.03090 0.01210 0.00000 0.00000 NaB 0.02000 0.02000 0.05000 0.01000 0.00000 0.00000 MgA 0.01570 0.01570 0.01650 0.00785 0.00000 0.00000 MnA 0.01570 0.01570 0.01650 0.00785 0.00000 0.00000 BeT2 0.01400 0.00590 0.01170 0.00295 0.00000 0.00000 MgT2 0.01400 0.00590 0.01170 0.00295 0.00000 0.00000 SiT1 0.01150 0.01190 0.01320 0.00570 -0.00020 -0.00210 O1 0.04700 0.02400 0.01240 0.01400 0.00000 0.00000 O2 0.02900 0.03930 0.03580 0.02770 -0.00060 -0.00400 O3 0.03040 0.01930 0.02220 0.01640 -0.01060 -0.00940