data_global
_chemical_name_mineral 'Potassic-arfvedsonite'
loop_
_publ_author_name
'Pekov I V'
'Chukanov N V'
'Lebedeva Y S'
'Pushcharovsky D Y'
'Ferraris G'
'Gula A'
'Zadov A E'
'Novakova  A A'
'Petersen O V'
_journal_name_full 'Neues Jahrbuch fur Mineralogie, Monatshefte'
_journal_volume 2004 
_journal_year 2004
_journal_page_first 555
_journal_page_last 574
_publ_section_title
;
 Potassicarfvedsonite, KNa2Fe2+4Fe3+Si8O22(OH)2,a K-dominant amphibole of the
 arfvedsonite series from agpaitic pegmatites - Mineral data, structure
 refinement and disorder in the A site
;
_database_code_amcsd 0014932
_chemical_compound_source 'Ilimaussaq, Greenland'
_chemical_formula_sum 'K.684 Na2.216 Fe4.46 Mn.2 Ti.06 Li.28 Si8 O23.6 F.4 H1.6'
_cell_length_a 10.002
_cell_length_b 18.054
_cell_length_c 5.319
_cell_angle_alpha 90
_cell_angle_beta 103.90
_cell_angle_gamma 90
_cell_volume 932.358
_exptl_crystal_density_diffrn      3.398
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-z'
  '-x,-y,-z'
  '1/2-x,1/2-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
KA*m   0.01300   0.50000   0.03900   0.34200   0.03800
NaA*m   0.06700   0.50000   0.12100   0.05400   0.02100
NaA2   0.00000   0.47200   0.00000   0.05400   0.03400
Fe2+M1   0.00000   0.09102   0.50000   0.70000   0.00873
Fe3+M1   0.00000   0.09102   0.50000   0.20000   0.00873
MnM1   0.00000   0.09102   0.50000   0.10000   0.00873
Fe2+M2   0.00000   0.18388   0.00000   0.58000   0.00721
Fe3+M2   0.00000   0.18388   0.00000   0.39000   0.00721
Ti4+M2   0.00000   0.18388   0.00000   0.03000   0.00721
Fe2+M3   0.00000   0.00000   0.00000   0.63000   0.00782
LiM3   0.00000   0.00000   0.00000   0.28000   0.00782
Fe3+M3   0.00000   0.00000   0.00000   0.09000   0.00782
NaM4   0.00000   0.27795   0.50000   1.00000 165.00000
Si1   0.27470   0.08610   0.29088   1.00000 669.00000
Si2   0.28655   0.17085   0.79998   1.00000 683.00000
O1   0.10992   0.09152   0.20780   1.00000  96.00000
O2   0.12016   0.17285   0.73360   1.00000 102.00000
O3   0.10840   0.00000   0.70810   0.80000   0.01240
F3   0.10840   0.00000   0.70810   0.20000   0.01240
O4   0.36430   0.24753   0.79910   1.00000 130.00000
O5   0.34497   0.12684   0.08020   1.00000 107.00000
O6   0.33740   0.11819   0.58140   1.00000 115.00000
O7   0.32710   0.00000   0.29680   1.00000 131.00000
H   0.22300   0.00000   0.77100   0.80000   0.07000