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 = 7.1 GPa
;
_database_code_amcsd 0006654
_chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8'
_cell_length_a 8.0764
_cell_length_b 12.8471
_cell_length_c 6.9991
_cell_angle_alpha 90.548
_cell_angle_beta 116.830
_cell_angle_gamma 87.903
_cell_volume 647.584
_exptl_crystal_density_diffrn      2.852
_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   0.25860  -0.00350   0.14370   0.98600   0.02343
NaM   0.25860  -0.00350   0.14370   0.01400   0.02343
AlT1o  -0.01290   0.19110   0.21340   0.94400   0.01596
SiT1o  -0.01290   0.19110   0.21340   0.05600   0.01596
AlT1m  -0.01170   0.81850   0.22920   0.06800   0.01874
SiT1m  -0.01170   0.81850   0.22920   0.93200   0.01874
AlT2o   0.69120   0.11990   0.33570   0.00900   0.01722
SiT2o   0.69120   0.11990   0.33570   0.99100   0.01722
AlT2m   0.68560   0.88660   0.34760   0.00900   0.01722
SiT2m   0.68560   0.88660   0.34760   0.99100   0.01722
Oa1   0.00040   0.15290  -0.01450   1.00000   0.02026
Oa2   0.60640   0.00570   0.29010   1.00000   0.02989
Obo   0.78190   0.14910   0.18270   1.00000   0.02254
Obm   0.78870   0.86120   0.19800   1.00000   0.02204
Oco   0.00640   0.31810   0.27310   1.00000   0.02584
Ocm   0.01960   0.68640   0.28750   1.00000   0.02634
Odo   0.17070   0.12220   0.40740   1.00000   0.02533
Odm   0.15740   0.87860   0.41540   1.00000   0.02292