data_global _chemical_name_mineral 'Sepiolite' loop_ _publ_author_name 'Post J E' 'Bish D L' 'Heaney P J' _journal_name_full 'American Mineralogist' _journal_volume 92 _journal_year 2007 _journal_page_first 91 _journal_page_last 97 _publ_section_title ; Synchrotron powder X-ray diffraction study of the structure and dehydration behavior of sepiolite Sample: T = 742 K ; _database_code_amcsd 0004270 _chemical_compound_source 'Durango, Mexico' _chemical_formula_sum 'Mg2 Si3 O9 H2' _cell_length_a 23.446 _cell_length_b 11.352 _cell_length_c 5.2782 _cell_angle_alpha 90 _cell_angle_beta 89.06 _cell_angle_gamma 90 _cell_volume 1404.651 _exptl_crystal_density_diffrn 2.637 _symmetry_space_group_name_H-M 'P 1 21/n 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Mg1 0.02380 0.02300 0.24400 0.02000 Mg2 0.08620 0.11500 0.72900 0.02000 Mg3 0.14310 0.17900 0.24400 0.02000 Mg4 0.19420 0.24600 0.71900 0.02000 Si1 0.08690 0.83300 0.56100 0.02000 Si2 0.20120 0.97000 0.53900 0.02000 Si3 0.25040 0.02700 0.02800 0.02000 O1 0.05580 0.95900 0.58000 0.02500 O-H2 0.10240 0.04200 0.07400 0.02500 O3 0.16640 0.09030 0.56800 0.02500 O4 0.21850 0.15300 0.04000 0.02500 O5 0.06800 0.74400 0.34000 0.02500 O6 0.15290 0.87000 0.57400 0.02500 O7 0.23500 0.95000 0.27300 0.02500 O8 0.23870 0.94700 0.78400 0.02500 O9 0.31720 0.03400 0.06100 0.02500 Wat10 0.27330 0.21100 0.51200 0.02500 Si1b 0.96680 0.23400 0.91600 0.02000 Si2b 0.08070 0.37400 0.89400 0.02000 Si3b 0.12780 0.45400 0.40500 0.02000 O1b 0.00920 0.12400 0.92300 0.02000 O-H2b 0.06010 0.17400 0.38600 0.02500 O3b 0.11720 0.25700 0.91700 0.02500 O4b 0.16530 0.33600 0.40700 0.02500 O5b 0.92600 0.22700 0.16600 0.02500 O6b 0.01520 0.33200 0.86800 0.02500 O7b 0.09200 0.44600 0.15200 0.02500 O8b 0.07980 0.44300 0.62700 0.02500