data_global _chemical_name_mineral 'Glaucophane' loop_ _publ_author_name 'Comodi P' 'Mellini M' 'Ungaretti L' 'Zanazzi P F' _journal_name_full 'European Journal of Mineralogy' _journal_volume 3 _journal_year 1991 _journal_page_first 485 _journal_page_last 499 _publ_section_title ; Compressibility and high pressure structure refinement of tremolite, pargasite and glaucophane Sample: pressure at 37 kbar ; _database_code_amcsd 0006417 _chemical_formula_sum 'Mg1.98 Fe1.42 Al1.6 (Na1.98 Li.02) Si8 O24 H2' _cell_length_a 9.349 _cell_length_b 17.610 _cell_length_c 5.257 _cell_angle_alpha 90 _cell_angle_beta 103.9 _cell_angle_gamma 90 _cell_volume 840.146 _exptl_crystal_density_diffrn 3.269 _symmetry_space_group_name_H-M 'C 1 2/m 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' '-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 MgM1 0.00000 0.09170 0.50000 0.72000 0.02420 FeM1 0.00000 0.09170 0.50000 0.28000 0.02420 AlM2 0.00000 0.17910 0.00000 0.80000 -0.00380 FeM2 0.00000 0.17910 0.00000 0.20000 -0.00380 MgM3 0.00000 0.00000 0.00000 0.54000 -0.00250 FeM3 0.00000 0.00000 0.00000 0.46000 -0.00250 NaM4 0.00000 0.27790 0.50000 0.99000 0.02260 LiM4 0.00000 0.27790 0.50000 0.01000 0.02260 SiT1 0.28740 0.08670 0.29330 1.00000 0.00650 SiT2 0.29590 0.17250 0.80850 1.00000 0.00030 O1 0.11020 0.09180 0.20150 1.00000 0.00550 O2 0.11760 0.17130 0.74760 1.00000 0.01250 O-H3 0.11110 0.00000 0.70080 1.00000 0.01090 O4 0.36890 0.25370 0.79140 1.00000 0.00390 O5 0.36560 0.13350 0.09260 1.00000 0.01430 O6 0.35180 0.12120 0.58740 1.00000 0.00040 O7 0.34570 0.00000 0.30360 1.00000 0.00670