data_global _chemical_name_mineral 'Richterite' loop_ _publ_author_name 'Oberti R' 'Vannucci R' 'Zanetti A' 'Tiepolo M' 'Brumm R C' _journal_name_full 'American Mineralogist' _journal_volume 85 _journal_year 2000 _journal_page_first 407 _journal_page_last 419 _publ_section_title ; A Crystal Chemical re-evaluation of amphibole/melt and amphibole/clinopyroxene DTi values in petrogenetic studies SAMPLE 28 ; _database_code_amcsd 0002378 _chemical_formula_sum 'O24 Si7.68 Al.16 Ti.41 Fe.9 Mg3.85 Ca Na1.12 K1.26 H2' _cell_length_a 10.046 _cell_length_b 18.065 _cell_length_c 5.297 _cell_angle_alpha 90 _cell_angle_beta 104.82 _cell_angle_gamma 90 _cell_volume 929.326 _exptl_crystal_density_diffrn 3.161 _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 O1 0.10994 0.08693 0.21904 1.00000 ? O2 0.11819 0.17058 0.72519 1.00000 ? O3 0.10601 0.00000 0.71362 0.13000 ? O-h3 0.10601 0.00000 0.71362 0.87000 ? O4 0.36222 0.24771 0.79698 1.00000 ? O5 0.34315 0.13003 0.09614 1.00000 ? O6 0.33993 0.11691 0.59376 1.00000 ? O7 0.33104 0.00000 0.30080 1.00000 ? SiT1 0.27505 0.08514 0.30033 0.96000 ? AlT1 0.27505 0.08514 0.30033 0.02000 ? TiT1 0.27505 0.08514 0.30033 0.02000 ? SiT2 0.28478 0.17162 0.80588 0.96000 ? AlT2 0.28478 0.17162 0.80588 0.02000 ? TiT2 0.28478 0.17162 0.80588 0.02000 ? FeM1 0.00000 0.08773 0.50000 0.18000 ? TiM1 0.00000 0.08773 0.50000 0.05000 ? MgM1 0.00000 0.08773 0.50000 0.77000 ? FeM2 0.00000 0.17997 0.00000 0.18000 ? TiM2 0.00000 0.17997 0.00000 0.05000 ? MgM2 0.00000 0.17997 0.00000 0.77000 ? FeM3 0.00000 0.00000 0.00000 0.18000 ? TiM3 0.00000 0.00000 0.00000 0.05000 ? MgM3 0.00000 0.00000 0.00000 0.77000 ? CaM4 0.00000 0.27764 0.50000 0.50000 ? NaM4 0.00000 0.27764 0.50000 0.50000 ? NaA 0.00000 0.50000 0.00000 0.04000 ? KA 0.00000 0.50000 0.00000 0.42000 ? NaAM 0.02413 0.50000 0.05462 0.04000 ? KAM 0.02413 0.50000 0.05462 0.42000 ? H 0.19755 0.00000 0.76213 1.00000 0.00646 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 O1 0.00621 0.00827 0.00704 -0.00089 0.00202 0.00000 O2 0.00765 0.00992 0.00784 -0.00089 0.00302 -0.00094 O3 0.00717 0.01157 0.00903 0.00000 0.00252 0.00000 O-h3 0.00717 0.01157 0.00903 0.00000 0.00252 0.00000 O4 0.01529 0.01157 0.01063 -0.00533 0.00277 -0.00141 O5 0.00908 0.01488 0.01302 0.00089 0.00479 0.00469 O6 0.00908 0.01653 0.00943 0.00089 0.00076 -0.00516 O7 0.00860 0.00661 0.01594 0.00000 0.00328 0.00000 SiT1 0.00526 0.00496 0.00598 -0.00089 0.00176 -0.00047 AlT1 0.00526 0.00496 0.00598 -0.00089 0.00176 -0.00047 TiT1 0.00526 0.00496 0.00598 -0.00089 0.00176 -0.00047 SiT2 0.00573 0.00661 0.00611 -0.00089 0.00126 0.00000 AlT2 0.00573 0.00661 0.00611 -0.00089 0.00126 0.00000 TiT2 0.00573 0.00661 0.00611 -0.00089 0.00126 0.00000 FeM1 0.00765 0.01323 0.00611 0.00000 0.00302 0.00000 TiM1 0.00765 0.01323 0.00611 0.00000 0.00302 0.00000 MgM1 0.00765 0.01323 0.00611 0.00000 0.00302 0.00000 FeM2 0.00765 0.00827 0.00877 0.00000 0.00277 0.00000 TiM2 0.00765 0.00827 0.00877 0.00000 0.00277 0.00000 MgM2 0.00765 0.00827 0.00877 0.00000 0.00277 0.00000 FeM3 0.00812 0.00661 0.00585 0.00000 0.00176 0.00000 TiM3 0.00812 0.00661 0.00585 0.00000 0.00176 0.00000 MgM3 0.00812 0.00661 0.00585 0.00000 0.00176 0.00000 CaM4 0.01577 0.00992 0.01541 0.00000 0.00957 0.00000 NaM4 0.01577 0.00992 0.01541 0.00000 0.00957 0.00000 NaA 0.01099 0.03141 0.02219 0.00000 0.01083 0.00000 KA 0.01099 0.03141 0.02219 0.00000 0.01083 0.00000 NaAM 0.03823 0.02315 0.03999 0.00000 0.03124 0.00000 KAM 0.03823 0.02315 0.03999 0.00000 0.03124 0.00000