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 = 0, in air ; _database_code_amcsd 0002214 _chemical_formula_sum 'Na B Si3 O8' _cell_length_a 7.83860 _cell_length_b 12.37330 _cell_length_c 6.80740 _cell_angle_alpha 93.31900 _cell_angle_beta 116.36800 _cell_angle_gamma 92.04000 _cell_volume 589.172 _exptl_crystal_density_diffrn 2.774 _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 Na 0.25820 0.00757 0.13302 B 0.01214 0.16173 0.22158 Si1m 0.00585 0.80964 0.20972 Si2o 0.70279 0.10181 0.32049 Si2m 0.68488 0.86453 0.35447 O(A1) 0.00780 0.13652 0.00413 O(A2) 0.59331 0.98123 0.27584 O(B)o 0.84495 0.09894 0.21117 O(B)m 0.81629 0.83485 0.23351 O(C)o 0.00661 0.27645 0.27360 O(C)m 0.02874 0.67957 0.20623 O(D)o 0.19027 0.11840 0.38278 O(D)m 0.19218 0.86780 0.41722 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 0.01242 0.02491 0.02065 0.00150 0.00508 -0.00864 B 0.00663 0.00584 0.00731 -0.00047 0.00282 0.00011 Si1m 0.00623 0.00552 0.00612 0.00120 0.00258 0.00063 Si2o 0.00589 0.00459 0.00766 -0.00001 0.00247 0.00011 Si2m 0.00597 0.00493 0.00698 0.00078 0.00258 0.00068 O(A1) 0.01304 0.00869 0.00852 0.00091 0.00501 0.00076 O(A2) 0.00692 0.00504 0.01132 0.00040 0.00237 0.00139 O(B)o 0.01225 0.00929 0.01627 -0.00320 0.00931 -0.00207 O(B)m 0.01074 0.01293 0.01506 0.00244 0.00786 0.00132 O(C)o 0.00953 0.00661 0.01494 -0.00070 0.00651 -0.00072 O(C)m 0.00985 0.00706 0.01184 0.00275 0.00250 0.00079 O(D)o 0.01090 0.01283 0.00769 0.00433 0.00224 0.00061 O(D)m 0.01054 0.01136 0.00849 -0.00096 0.00153 -0.00044