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 = 1.4 GPa
;
_database_code_amcsd 0006650
_chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8'
_cell_length_a 8.4812
_cell_length_b 12.930
_cell_length_c 7.1784
_cell_angle_alpha 90.436
_cell_angle_beta 116.163
_cell_angle_gamma 87.97
_cell_volume 706.072
_exptl_crystal_density_diffrn      2.616
_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   0.27920  -0.00490   0.13720   0.98600   0.02774
NaM   0.27920  -0.00490   0.13720   0.01400   0.02774
AlT1o   0.00600   0.18860   0.21760   0.94400   0.01748
SiT1o   0.00600   0.18860   0.21760   0.05600   0.01748
AlT1m   0.00620   0.82020   0.23060   0.06800   0.01672
SiT1m   0.00620   0.82020   0.23060   0.93200   0.01672
AlT2o   0.70610   0.12050   0.33950   0.00900   0.01659
SiT2o   0.70610   0.12050   0.33950   0.99100   0.01659
AlT2m   0.70210   0.88610   0.34790   0.00900   0.01811
SiT2m   0.70210   0.88610   0.34790   0.99100   0.01811
Oa1   0.00230   0.14100  -0.01440   1.00000   0.02305
Oa2   0.62940   0.00860   0.28620   1.00000   0.02166
Obo   0.81650   0.14750   0.21750   1.00000   0.02052
Obm   0.82600   0.86110   0.23330   1.00000   0.03141
Oco   0.02980   0.31940   0.25370   1.00000   0.02064
Ocm   0.03270   0.69180   0.27030   1.00000   0.02254
Odo   0.19000   0.12290   0.40660   1.00000   0.02242
Odm   0.17490   0.87340   0.41270   1.00000   0.02419