data_global
_chemical_name_mineral 'Maghrebite'
loop_
_publ_author_name
'Meisser N'
'Brugger J'
'Krivovichev S'
'Armbruster T'
'Favreau G'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 24 
_journal_year 2012
_journal_page_first 717
_journal_page_last 726
_publ_section_title
;
 Description and crystal structure of maghrebite, MgAl2(AsO4)2(OH)2*8H2O,
 from Aghbar, Anti-Atlas, Morocco: first arsenate in the laueite mineral group
;
_database_code_amcsd 0019348
_chemical_compound_source 'Aghbar, Anti-Atlas, Morocco'
_chemical_formula_sum 'Mg Al2 As2 O18 H18'
_cell_length_a 5.4363
_cell_length_b 10.500
_cell_length_c 7.075
_cell_angle_alpha 97.701
_cell_angle_beta 110.295
_cell_angle_gamma 102.021
_cell_volume 360.987
_exptl_crystal_density_diffrn      2.458
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Mg   0.50000   0.50000   0.00000   0.01330
Al1   0.00000   0.00000   0.50000   0.01080
Al2   0.00000   0.00000   0.00000   0.01130
As  -0.51690  -0.16695  -0.92788   0.01300
O-h1  -0.12790   0.00750  -0.28470   0.01480
O2  -0.31190  -0.14970  -1.06330   0.01460
O3  -0.37020  -0.06660  -0.68850   0.01580
O4  -0.80920  -0.12680  -1.06030   0.01620
O5  -0.60330  -0.32750  -0.91180   0.01930
Ow6  -0.02220   0.18510  -0.53070   0.01980
Ow7  -0.59810  -0.30760  -0.50510   0.02830
Ow8  -0.16900  -0.38760  -0.04350   0.03340
Ow9  -0.25890  -0.48780  -0.68700   0.03190
H1  -0.11000   0.16000  -0.68100   0.05000
H2   0.02500  -0.38400   0.00400   0.13000
H3  -0.16600   0.21000  -0.49500   0.12000
H4  -0.45300  -0.22800  -0.41600   0.05000
H5  -0.30500  -0.53600  -0.58900   0.07000
H6  -0.21000  -0.40000  -0.59600   0.04000
H7  -0.58000  -0.31600  -0.63900   0.04000
H8  -0.23700  -0.30900  -0.05000   0.08000
H9  -0.32000   0.00000  -0.36100   0.12000
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
Mg 0.00930 0.01190 0.02350 0.00740 0.00790 0.00820
Al1 0.00740 0.01460 0.01310 0.00600 0.00430 0.00590
Al2 0.00720 0.01600 0.01420 0.00740 0.00450 0.00710
As 0.00770 0.01740 0.01780 0.00810 0.00540 0.00830
O-h1 0.01000 0.02300 0.01500 0.00900 0.00400 0.00900
O2 0.01100 0.01800 0.01900 0.00750 0.00800 0.00560
O3 0.00600 0.01900 0.02300 0.00610 0.00400 0.00700
O4 0.00800 0.02800 0.01800 0.01300 0.00400 0.01100
O5 0.01300 0.01800 0.02900 0.00600 0.00900 0.00800
Ow6 0.01800 0.02400 0.02100 0.01100 0.00800 0.00600
Ow7 0.02400 0.03600 0.03200 0.01300 0.01500 0.01400
Ow8 0.01500 0.03000 0.06300 0.01100 0.01700 0.02100
Ow9 0.02800 0.03100 0.03300 0.01000 0.00600 0.00900