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 = 4.4 GPa
;
_database_code_amcsd 0006652
_chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8'
_cell_length_a 8.276
_cell_length_b 12.878
_cell_length_c 7.0936
_cell_angle_alpha 90.38
_cell_angle_beta 116.372
_cell_angle_gamma 87.89
_cell_volume 676.845
_exptl_crystal_density_diffrn      2.729
_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   0.26980  -0.00580   0.13870   0.98600   0.02419
NaM   0.26980  -0.00580   0.13870   0.01400   0.02419
AlT1o  -0.00140   0.18840   0.21660   0.94400   0.01659
SiT1o  -0.00140   0.18840   0.21660   0.05600   0.01659
AlT1m  -0.00110   0.82070   0.22970   0.06800   0.01824
SiT1m  -0.00110   0.82070   0.22970   0.93200   0.01824
AlT2o   0.69690   0.12080   0.33760   0.00900   0.01798
SiT2o   0.69690   0.12080   0.33760   0.99100   0.01798
AlT2m   0.69310   0.88650   0.34750   0.00900   0.01874
SiT2m   0.69310   0.88650   0.34750   0.99100   0.01874
Oa1   0.00020   0.14540  -0.01410   1.00000   0.02520
Oa2   0.61640   0.00870   0.28870   1.00000   0.02571
Obo   0.80140   0.14450   0.20380   1.00000   0.02292
Obm   0.81240   0.85900   0.21800   1.00000   0.02723
Oco   0.01820   0.31820   0.25920   1.00000   0.02786
Ocm   0.02270   0.69190   0.27680   1.00000   0.02419
Odo   0.18070   0.12420   0.40630   1.00000   0.02356
Odm   0.16950   0.87600   0.41190   1.00000   0.02584