data_global _chemical_name_mineral 'Vermiculite' loop_ _publ_author_name 'Haase D J' 'Weiss E J' 'Steinfink H' _journal_name_full 'American Mineralogist' _journal_volume 48 _journal_year 1963 _journal_page_first 261 _journal_page_last 270 _publ_section_title ; The crystal structure of a hexamethylene-diamine-vermiculite complex ; _database_code_amcsd 0000122 _chemical_formula_sum 'Mg3 Si4 O12 N4 C12' _cell_length_a 5.33 _cell_length_b 9.18 _cell_length_c 17.12 _cell_angle_alpha 90 _cell_angle_beta 97.0 _cell_angle_gamma 90 _cell_volume 831.428 _exptl_crystal_density_diffrn 2.306 _symmetry_space_group_name_H-M 'C 1 2 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 Mg1 0.00000 0.00000 0.00000 Mg2 0.00000 0.33300 0.00000 Mg3 0.00000 0.66700 0.00000 Si1 0.39670 0.99200 0.16070 Si2 0.39670 0.33300 0.16070 Ob 0.35790 0.99200 0.06240 Ob 0.35790 0.34800 0.06240 Ob 0.35790 0.66170 0.06240 O1 0.43220 0.17750 0.17750 O2 0.14820 0.40400 0.19600 O3 0.14820 0.92900 0.19600 N1 0.32000 0.16000 0.33000 C1 0.15000 0.18750 0.39250 C2 0.13000 0.34750 0.40350 C3 -0.04000 0.37500 0.46900 C4 -0.06000 0.53500 0.48000 C5 -0.23000 0.56250 0.54550 C6 0.75000 0.72250 0.55650 N2 -0.42000 0.75000 0.61900