data_global
_chemical_name_mineral 'Microcline'
loop_
_publ_author_name
'Allan D R'
'Angel R J'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 9 
_journal_year 1997
_journal_page_first 263
_journal_page_last 275
_publ_section_title
;
 A high-pressure structural study of microcline (KAlSi3O8) to 7 GPa
 P = 0.0 GPa
;
_database_code_amcsd 0006649
_chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8'
_cell_length_a 8.5733
_cell_length_b 12.9375
_cell_length_c 7.2075
_cell_angle_alpha 90.530
_cell_angle_beta 115.972
_cell_angle_gamma 87.968
_cell_volume 718.229
_exptl_crystal_density_diffrn      2.572
_symmetry_space_group_name_H-M 'C -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'
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
KM   0.28410  -0.00710   0.13670   0.98600   0.02495
NaM   0.28410  -0.00710   0.13670   0.01400   0.02495
AlT1o   0.01020   0.18810   0.21800   0.94400   0.01646
SiT1o   0.01020   0.18810   0.21800   0.05600   0.01646
AlT1m   0.00880   0.81820   0.23150   0.06800   0.01646
SiT1m   0.00880   0.81820   0.23150   0.93200   0.01646
AlT2o   0.71050   0.12060   0.34050   0.00900   0.01646
SiT2o   0.71050   0.12060   0.34050   0.99100   0.01646
AlT2m   0.70690   0.88640   0.34970   0.00900   0.01697
SiT2m   0.70690   0.88640   0.34970   0.99100   0.01697
Oa1   0.00170   0.14060  -0.01570   1.00000   0.02191
Oa2   0.63960   0.00500   0.28590   1.00000   0.01912
Obo   0.82110   0.14990   0.22050   1.00000   0.02482
Obm   0.83240   0.85580   0.23800   1.00000   0.02634
Oco   0.03470   0.32140   0.25300   1.00000   0.02254
Ocm   0.03840   0.69120   0.26840   1.00000   0.02090
Odo   0.18840   0.12530   0.40450   1.00000   0.02014
Odm   0.17680   0.87000   0.41020   1.00000   0.02115