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