data_global
_chemical_name_mineral 'Ferri-obertiite'
loop_
_publ_author_name
'Hawthorne F C'
'Cooper M A'
'Grice J D'
'Ottolini L'
_journal_name_full 'American Mineralogist'
_journal_volume 85 
_journal_year 2000
_journal_page_first 236
_journal_page_last 241
_publ_section_title
;
 A new anhydrous amphibole from the Eifel region, Germany:
 Description and crystal structure of obertiite, NaNa2(Mg3FeTi)Si8O22O2
 Note: M1A and M1 are interchanged in the bond length table
;
_database_code_amcsd 0002347
_chemical_compound_source 'Eifel region, Germany'
_chemical_formula_sum 'O24 Si8 Ti.86 Mn.37 Mg2.13 Fe.71 Al.03 Na2.66 Ca2 K.18'
_cell_length_a 9.776
_cell_length_b 17.919
_cell_length_c 5.292
_cell_angle_alpha 90
_cell_angle_beta 104.05
_cell_angle_gamma 90
_cell_volume 899.299
_exptl_crystal_density_diffrn      3.363
_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
O1   0.11360   0.08580   0.21760   1.00000 ?
O2   0.11700   0.16520   0.72490   1.00000 ?
O3   0.10340   0.00000   0.70610   1.00000 ?
O4   0.35780   0.25080   0.79950   1.00000 ?
O5   0.34970   0.12760   0.08050   1.00000 ?
O6   0.34610   0.12000   0.57980   1.00000 ?
O7   0.34340   0.00000   0.29960   1.00000 ?
SiT1   0.28360   0.08524   0.29410   1.00000 ?
SiT2   0.28830   0.17078   0.79850   1.00000 ?
Ti1A   0.00000   0.07880   0.50000   0.43000 ?
Mn1A   0.00000   0.07880   0.50000   0.18500 ?
Mg1   0.00000   0.09100   0.50000   0.38500 ?
Mg2   0.00000   0.18172   0.00000   0.66000 ?
Fe2   0.00000   0.18172   0.00000   0.32500 ?
Al2   0.00000   0.18172   0.00000   0.01500 ?
Mg3   0.00000   0.00000   0.00000   0.04000 ?
Na4   0.00000   0.27380   0.50000   0.92000 ?
Fe4   0.00000   0.27380   0.50000   0.03000 ?
Ca4   0.00000   0.27380   0.50000   1.00000 ?
KAm   0.04800   0.50000   0.10100   0.09000   0.02000
NaAm   0.04800   0.50000   0.10100   0.19000   0.02000
NaA2   0.00000   0.48860   0.00000   0.22000   0.02000
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
O1 0.00620 0.00470 0.00910 0.00000 0.00070 0.00050
O2 0.00520 0.01280 0.00400 0.00000 0.00010 -0.00070
O3 0.00540 0.01270 0.00430 0.00000 0.00210 0.00000
O4 0.01150 0.00680 0.01110 0.00120 0.00050 -0.00360
O5 0.00690 0.01300 0.00750 0.00490 0.00300 -0.00080
O6 0.00840 0.01050 0.00660 -0.00460 0.00030 -0.00010
O7 0.00990 0.00870 0.01380 0.00000 0.00510 0.00000
SiT1 0.00580 0.00550 0.00500 -0.00040 0.00130 0.00080
SiT2 0.00510 0.00630 0.00400 0.00030 0.00010 -0.00080
Ti1A 0.00940 0.00940 0.00470 0.00000 0.00020 0.00000
Mn1A 0.00940 0.00940 0.00470 0.00000 0.00020 0.00000
Mg1 0.00940 0.00940 0.00470 0.00000 0.00020 0.00000
Mg2 0.00770 0.00840 0.00690 0.00000 0.00240 0.00000
Fe2 0.00770 0.00840 0.00690 0.00000 0.00240 0.00000
Al2 0.00770 0.00840 0.00690 0.00000 0.00240 0.00000
Mg3 0.00680 0.00820 0.00810 0.00000 0.00070 0.00000
Na4 0.02400 0.01590 0.02530 0.00000 0.01600 0.00000
Fe4 0.02400 0.01590 0.02530 0.00000 0.01600 0.00000
Ca4 0.02400 0.01590 0.02530 0.00000 0.01600 0.00000