#------------------------------------------------------------------------------
#$Date: 2008-01-26 15:05:32 +0200 (Sat, 26 Jan 2008) $
#$Revision: 19 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9001583.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_9001583
_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 2M1 from Valle del Cervo syenitic complex
;
_chemical_formula_sum '(Si2.784 Al1.216) Fe1.215 Mg1.545 Mn.018 Ti.225 K.946 Na.
_cell_length_a 5.339
_cell_length_b 9.249
_cell_length_c 20.196
_cell_angle_alpha 90
_cell_angle_beta 95.06
_cell_angle_gamma 90
_cell_volume 993.400
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-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
SiT1   0.46150   0.24980   0.13700   0.69600
AlT1   0.46150   0.24980   0.13700   0.30400
SiT2   0.96360   0.41660   0.13710   0.69600
AlT2   0.96360   0.41660   0.13710   0.30400
Fe1   0.75000   0.25000   0.00000   0.40500
Mg1   0.75000   0.25000   0.00000   0.51500
Mn1   0.75000   0.25000   0.00000   0.00600
Ti1   0.75000   0.25000   0.00000   0.07500
Fe2   0.24730   0.08250   0.00000   0.40500
Mg2   0.24730   0.08250   0.00000   0.51500
Mn2   0.24730   0.08250   0.00000   0.00600
Ti2   0.24730   0.08250   0.00000   0.07500
K   0.00000   0.08520   0.25000   0.94600
Na   0.00000   0.08520   0.25000   0.03200
O11   0.73850   0.31760   0.16560   1.00000
O21   0.23680   0.34780   0.16650   1.00000
O22   0.44180   0.08440   0.16620   1.00000
O31   0.43240   0.23760   0.05500   1.00000
O32   0.93590   0.40470   0.05500   1.00000
O4   0.93510   0.06950   0.05180   1.00000