data_9004191
_chemical_name 'Microcline'
loop_
_publ_author_name
'Blasi A'
'De Pol Blasi C'
'Zanazzi P F'
_journal_name_full "The Canadian Mineralogist"
_journal_volume 25
_journal_year 1987
_journal_page_first 527
_journal_page_last 537
_publ_section_title
;
 A re-examination of the Pellotsalo microcline: Mineralogical implications and
 genetic considerations
;
_chemical_formula_sum '(K.95 Na.05) Al Si3 O8'
_cell_length_a 8.5714
_cell_length_b 12.9646
_cell_length_c 7.2217
_cell_angle_alpha 90.6
_cell_angle_beta 115.9
_cell_angle_gamma 87.7
_cell_volume 721.300
_symmetry_space_group_name_H-M 'C -1'
loop_
_symmetry_equiv_pos_as_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
K   0.28260   0.99280   0.13670   0.95000
Na   0.28260   0.99280   0.13670   0.05000
Al   0.01000   0.18770   0.21700   1.00000
Si1   0.00980   0.81960   0.23230   1.00000
Si2   0.71110   0.12040   0.34010   1.00000
Si3   0.70570   0.88560   0.35050   1.00000
O1   0.00070   0.14480   0.98290   1.00000
O2   0.63650   0.00550   0.28570   1.00000
O3   0.82120   0.14770   0.21990   1.00000
O4   0.83190   0.85730   0.24010   1.00000
O5   0.03530   0.32000   0.25110   1.00000
O6   0.03810   0.69550   0.27020   1.00000
O7   0.19030   0.12290   0.40550   1.00000
O8   0.17540   0.87450   0.41180   1.00000