data_1100012
_chemical_name_systematic          'Potassium alumosilicate hydrate *'
_chemical_name_mineral             'Muscovite 2M1'
_chemical_formula_sum              'H2 Al3 K O12 Si3'
_publ_section_title
;
The Structure of Muscovite, K Al2 (Si3 Al) O10 (O H)2
;
_publ_author_name                  'Radoslovich, E W'
_journal_name_full                 'Acta Crystallographica (1,1948-23,1967)'
_journal_volume                    13
_journal_year                      1960
_journal_page_first                919
_journal_page_last                 932
_cell_length_a                     5.189(10)
_cell_length_b                     8.996(6)
_cell_length_c                     20.095990000(19999998)
_cell_angle_alpha                  90
_cell_angle_beta                   95.18(8)
_cell_angle_gamma                  90
_cell_volume                       934.3
_cell_formula_units_Z              4
_exptl_crystal_density_meas        2.8
_symmetry_space_group_name_H-M     'C 1 2/c 1'
_symmetry_Int_Tables_number        15
_symmetry_cell_setting             monoclinic
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '-x,y,1/2-z'
  '-x,-y,-z'
  'x,-y,1/2+z'
  '1/2+x,1/2+y,z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2-y,-z'
  '1/2+x,1/2-y,1/2+z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Al3+   3.000
  O2-   -2.000
  Si4+   4.000
  K1+    1.000
  H1+    1.000
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
  Al1   Al3+   8 f 0.2484(15) 0.0871(40) 0.0016(16) 1.  0 d
  O1    O2-    8 f 0.465(27) 0.945(28) 0.0527(23) 1.  0 d
  O2    O2-    8 f 0.4250(31) 0.26(1) 0.0542(8) 1.  0 d
  O3    O2-    8 f 0.453(15) 0.558(25) 0.052(6) 1.  1 d
  O4    O2-    8 f 0.4080(721) 0.096(13) 0.168(4) 1.  0 d
  O5    O2-    8 f 0.245(17) 0.802(31) 0.162(2) 1.  0 d
  O6    O2-    8 f 0.2629(349) 0.3713(382) 0.1674(34) 1.  0 d
  Si1   Si4+   8 f 0.4625(44) 0.9242(72) 0.1372(22) 0.5  0 d
  Si2   Si4+   8 f 0.4593(77) 0.255(5) 0.1365(15) 1.  0 d
  Al2   Al3+   8 f 0.4625(44) 0.9242(72) 0.1372(22) 0.5  0 d
  K1    K1+    4 e 0. 0.1016(186) 0.25 1.  0 d
  H1    H1+    8 f -1. -1. -1. 1.  0 dum
_refine_ls_R_factor_all            0.125