data_global _chemical_name_mineral 'Lizardite' loop_ _publ_author_name 'Mellini M' 'Zanazzi P F' _journal_name_full 'American Mineralogist' _journal_volume 72 _journal_year 1987 _journal_page_first 943 _journal_page_last 948 _publ_section_title ; Crystal structures of lizardite-1T and lizardite-2H1 from Coli, Italy Sample: Lizardite-1T Note: U(1,2) for Mg/O3 altered to match symmetry constraints. Note: Thermal ellipsoid for O1 is non-positive definite ; _database_code_amcsd 0001114 _chemical_formula_sum 'Si2 Mg3 O9 H4' _cell_length_a 5.325 _cell_length_b 5.325 _cell_length_c 7.259 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 178.257 _exptl_crystal_density_diffrn 2.581 _symmetry_space_group_name_H-M 'P 3 1 m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x-y,-y,z' '-y,x-y,z' 'y,x,z' '-x+y,-x,z' '-x,-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 Si 0.33333 0.66667 0.07480 ? Mg 0.33220 0.00000 0.45570 ? O1 0.33333 0.66667 0.29200 ? O2 0.50450 0.00000 -0.00820 ? O3 0.66550 0.00000 0.58990 ? O4 0.00000 0.00000 0.30800 ? H3 0.58000 0.00000 0.73800 0.02200 H4 0.00000 0.00000 0.20000 0.02300 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 Si 0.00060 0.00060 0.02340 0.00030 0.00000 0.00000 Mg 0.00280 0.00310 0.02420 0.00155 0.00260 0.00000 O1 -0.00600 -0.00600 0.04050 -0.00300 0.00000 0.00000 O2 0.01470 0.00760 0.01470 0.00380 -0.00450 0.00000 O3 0.01090 0.01270 0.02570 0.00635 0.00280 0.00000 O4 0.00840 0.00840 0.01080 0.00420 0.00000 0.00000