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 = 2.9 GPa
;
_database_code_amcsd 0006651
_chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8'
_cell_length_a 8.3722
_cell_length_b 12.899
_cell_length_c 7.1328
_cell_angle_alpha 90.38
_cell_angle_beta 116.290
_cell_angle_gamma 87.93
_cell_volume 690.128
_exptl_crystal_density_diffrn      2.676
_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   0.27520  -0.00630   0.13660   0.98600   0.02723
NaM   0.27520  -0.00630   0.13660   0.01400   0.02723
AlT1o   0.00240   0.18900   0.21710   0.94400   0.01672
SiT1o   0.00240   0.18900   0.21710   0.05600   0.01672
AlT1m   0.00370   0.81830   0.22860   0.06800   0.01773
SiT1m   0.00370   0.81830   0.22860   0.93200   0.01773
AlT2o   0.70180   0.11990   0.33940   0.00900   0.01608
SiT2o   0.70180   0.11990   0.33940   0.99100   0.01608
AlT2m   0.69720   0.88680   0.34760   0.00900   0.01748
SiT2m   0.69720   0.88680   0.34760   0.99100   0.01748
Oa1  -0.00120   0.14370  -0.01450   1.00000   0.02064
Oa2   0.62300   0.00810   0.28650   1.00000   0.02166
Obo   0.80660   0.14790   0.21140   1.00000   0.02343
Obm   0.82010   0.86110   0.22700   1.00000   0.03103
Oco   0.02400   0.31890   0.25480   1.00000   0.02710
Ocm   0.02890   0.69320   0.27310   1.00000   0.02128
Odo   0.18560   0.12340   0.40650   1.00000   0.02533
Odm   0.17580   0.87420   0.41220   1.00000   0.02318