data_9000303
_chemical_name 'Sanidine'
loop_
_publ_author_name
'Phillips M W'
'Ribbe P H'
_journal_name_full "American Mineralogist"
_journal_volume 58
_journal_year 1973
_journal_page_first 263
_journal_page_last 270
_publ_section_title
;
 The structures of monoclinic potassium-rich feldspars
;
_chemical_formula_sum '(Si3 Al) K O8'
_cell_length_a 8.539
_cell_length_b 13.015
_cell_length_c 7.179
_cell_angle_alpha 90
_cell_angle_beta 115.99
_cell_angle_gamma 90
_cell_volume 717.154
_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
Si1   0.00940   0.18430   0.22390   0.71000
Al1   0.00940   0.18430   0.22390   0.29000
Si2   0.70790   0.11770   0.34440   0.79000
Al2   0.70790   0.11770   0.34440   0.21000
K   0.28390   0.00000   0.13660   1.00000
OA(1)   0.00000   0.14610   0.00000   1.00000
OA(2)   0.63300   0.00000   0.28510   1.00000
OB   0.82760   0.14530   0.22560   1.00000
OC   0.03300   0.31030   0.25720   1.00000
OD   0.18130   0.12650   0.40380   1.00000