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 = 6.2 GPa
;
_database_code_amcsd 0006653
_chemical_formula_sum '(K.986 Na.014) (Al1.03 Si2.97) O8'
_cell_length_a 8.1578
_cell_length_b 12.8558
_cell_length_c 7.0406
_cell_angle_alpha 90.49
_cell_angle_beta 116.616
_cell_angle_gamma 87.86
_cell_volume 659.648
_exptl_crystal_density_diffrn      2.800
_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   0.26520  -0.00560   0.14120   0.98600   0.02761
NaM   0.26520  -0.00560   0.14120   0.01400   0.02761
AlT1o  -0.00650   0.19070   0.21490   0.94400   0.01672
SiT1o  -0.00650   0.19070   0.21490   0.05600   0.01672
AlT1m  -0.00630   0.81960   0.22950   0.06800   0.01887
SiT1m  -0.00630   0.81960   0.22950   0.93200   0.01887
AlT2o   0.69550   0.11770   0.33690   0.00900   0.01988
SiT2o   0.69550   0.11770   0.33690   0.99100   0.01988
AlT2m   0.68900   0.88530   0.34590   0.00900   0.01950
SiT2m   0.68900   0.88530   0.34590   0.99100   0.01950
Oa1   0.00510   0.14700  -0.01110   1.00000   0.02229
Oa2   0.60720   0.01730   0.29280   1.00000   0.02786
Obo   0.79160   0.14740   0.19240   1.00000   0.02419
Obm   0.79790   0.86390   0.20630   1.00000   0.02216
Oco   0.01110   0.31950   0.26610   1.00000   0.02685
Ocm   0.01470   0.69920   0.28200   1.00000   0.02774
Odo   0.17310   0.12520   0.40640   1.00000   0.02318
Odm   0.16300   0.87750   0.41340   1.00000   0.02748