data_global _chemical_name_mineral 'Tremolite' loop_ _publ_author_name 'Cameron M' 'Gibbs G V' _journal_name_full 'American Mineralogist' _journal_volume 58 _journal_year 1973 _journal_page_first 879 _journal_page_last 888 _publ_section_title ; The crystal structure and bonding of fluor-tremolite: A comparison with hydroxyl tremolite ; _database_code_amcsd 384 _chemical_formula_sum 'Si8 Mg5 Ca2 O22 F2' _cell_length_a 9.787 _cell_length_b 18.004 _cell_length_c 5.263 _cell_angle_alpha 90.0 _cell_angle_beta 104.44 _cell_angle_gamma 90.0 _cell_volume 898.071 _exptl_crystal_density_diffrn 3.019 _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 Si1 0.2829 0.0834 0.296 Si2 0.29 0.1707 0.8041 Mg1 0.0 0.0885 0.5 Mg2 0.0 0.176 0.0 Mg3 0.0 0.0 0.0 Ca4 0.0 0.2771 0.5 O1 0.1126 0.0847 0.2179 O2 0.1187 0.1702 0.7239 F3 0.102 0.0 0.7124 O4 0.3644 0.2484 0.7907 O5 0.3471 0.1351 0.1001 O6 0.3444 0.1197 0.5857 O7 0.3408 0.0 0.2922 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 Si1 0.00396 0.00427 0.00338 -0.00052 0.00174 0.00046 Si2 0.00387 0.00608 0.00271 -0.00043 -0.00017 0.00051 Mg1 0.00428 0.0069 0.00407 0.0 -0.00044 0.0 Mg2 0.00897 0.00657 0.00537 0.0 0.00247 0.0 Mg3 0.00478 0.00394 0.00644 0.0 0.00046 0.0 Ca4 0.01133 0.01084 0.00895 0.0 0.00641 0.0 O1 0.00537 0.00624 0.00659 0.00078 0.00022 5e-05 O2 0.00956 0.00805 0.00503 -9e-05 0.00232 -0.00084 F3 0.00555 0.01166 0.00763 0.0 0.00215 0.0 O4 0.0076 0.0069 0.0075 -0.0019 0.00117 -0.0013 O5 0.00883 0.00657 0.0075 0.00104 0.00098 0.00335 O6 0.00446 0.01215 0.00553 0.00207 7e-05 -0.00019 O7 0.01028 0.01149 0.01163 0.0 0.00573 0.0