data_global
_chemical_name_mineral 'Reedmergnerite'
loop_
_publ_author_name
'Downs R T'
'Yang H'
'Hazen R M'
'Finger L W'
'Prewitt C T'
_journal_name_full 'American Mineralogist'
_journal_volume 84 
_journal_year 1999
_journal_page_first 333
_journal_page_last 340
_publ_section_title
;
 Compressibility mechanisms of alkali feldspars: New data from reedmergnerite
 Sample from Joseph Smith #1 mine, Duchesne Co., Utah,  NMNH 140
 P = 3.00 GPa
;
_database_code_amcsd 0002218
_chemical_formula_sum 'Na B Si3 O8'
_cell_length_a 7.6589
_cell_length_b 12.2675
_cell_length_c 6.7512
_cell_angle_alpha 93.374
_cell_angle_beta 116.256
_cell_angle_gamma 92.222
_cell_volume 566.393
_exptl_crystal_density_diffrn      2.885
_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_U_iso_or_equiv
Na   0.25437   0.00877   0.12885 ?
B   0.01277   0.15886   0.22204   0.00735
Si1m   0.00523   0.81008   0.20852   0.00709
Si2o   0.69921   0.09903   0.31922   0.00671
Si2m   0.67605   0.86236   0.35393   0.00684
O(A1)   0.00800   0.13500   0.00419   0.01102
O(A2)   0.58158   0.97995   0.27458   0.00646
O(B)o   0.84820   0.08975   0.21607   0.00988
O(B)m   0.81033   0.83345   0.22919   0.01203
O(C)o  -0.00565   0.27284   0.27018   0.00823
O(C)m   0.02683   0.67902   0.20010   0.01153
O(D)o   0.19809   0.12114   0.38319   0.01292
O(D)m   0.19512   0.86893   0.41778   0.01418
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na 0.01564 0.02139 0.03188 0.00407 0.01233 -0.00452