data_9001582
_chemical_name 'Biotite'
loop_
_publ_author_name
'Bigi S'
'Brigatti M F'
_journal_name_full "American Mineralogist"
_journal_volume 79
_journal_year 1994
_journal_page_first 63
_journal_page_last 72
_publ_section_title
;
 Crystal chemistry and microstructures of plutonic biotite
 Sample 1M from Valle del Cervo syenitic complex
;
_chemical_formula_sum 'Si2.808 Al1.207 Fe.4 Mg.512 Mn.007 Ti.067 Na.034 K1.906 O
_cell_length_a 5.335
_cell_length_b 9.244
_cell_length_c 10.206
_cell_angle_alpha 90
_cell_angle_beta 100.08
_cell_angle_gamma 90
_cell_volume 495.558
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_symmetry_equiv_pos_as_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
SiT   0.07520   0.16690   0.22580   0.70200
AlT   0.07520   0.16690   0.22580   0.29800
Al1   0.00000   0.00000   0.50000   0.01500
Fe1   0.00000   0.00000   0.50000   0.40000
Mg1   0.00000   0.00000   0.50000   0.51200
Mn1   0.00000   0.00000   0.50000   0.00700
Ti1   0.00000   0.00000   0.50000   0.06700
Na2   0.00000   0.33430   0.50000   0.01700
K2   0.00000   0.33430   0.50000   0.95300
O1   0.02470   0.00000   0.16880   1.00000
O2   0.32190   0.23360   0.16830   1.00000
O3   0.13340   0.16750   0.39050   1.00000
O4   0.13010   0.50000   0.39520   1.00000