data_global _chemical_name_mineral 'Pargasite' loop_ _publ_author_name 'Makino K' 'Tomita K' _journal_name_full 'American Mineralogist' _journal_volume 74 _journal_year 1989 _journal_page_first 1097 _journal_page_last 1105 _publ_section_title ; Cation distribution in the octahedral sites of hornblendes sample P-P from Parau Island ; _database_code_amcsd 0001270 _chemical_formula_sum '(Si5.96 Al2.04) Mg3.83 Fe1.31 Ca1.86 Na2.28 O24 H2' _cell_length_a 9.834 _cell_length_b 18.01 _cell_length_c 5.297 _cell_angle_alpha 90 _cell_angle_beta 105.04 _cell_angle_gamma 90 _cell_volume 906.017 _exptl_crystal_density_diffrn 3.305 _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 Si1 0.28160 0.08520 0.30090 0.60000 0.00494 Al1 0.28160 0.08520 0.30090 0.40000 0.00494 Si2 0.29140 0.17250 0.81130 0.89000 0.00494 Al2 0.29140 0.17250 0.81130 0.11000 0.00494 Mg1 0.00000 0.08790 0.50000 0.75900 0.00849 Fe1 0.00000 0.08790 0.50000 0.24100 0.00849 Mg2 0.00000 0.17680 0.00000 0.76300 0.00519 Fe2 0.00000 0.17680 0.00000 0.23700 0.00519 Mg3 0.00000 0.00000 0.00000 0.76400 0.00595 Fe3 0.00000 0.00000 0.00000 0.23600 0.00595 Ca4 0.00000 0.27850 0.50000 0.93000 0.01153 Mg4 0.00000 0.27850 0.50000 0.01100 0.01153 Fe4 0.00000 0.27850 0.50000 0.05900 0.01153 NaAm 0.02920 0.50000 0.12450 0.57000 0.03141 NaA2 0.00000 0.47930 0.00000 0.57000 0.02989 O1 0.10740 0.08740 0.21600 1.00000 0.01001 O2 0.11970 0.17330 0.73160 1.00000 0.00861 O-H3 0.10870 0.00000 0.71570 1.00000 0.01064 O4 0.36720 0.24970 0.78750 1.00000 0.01140 O5 0.34950 0.14030 0.11000 1.00000 0.01140 O6 0.34400 0.11650 0.60700 1.00000 0.01254 O7 0.33930 0.00000 0.27450 1.00000 0.01368