data_global _chemical_name_mineral 'Pargasite' loop_ _publ_author_name 'Sharma A' 'Jenkins D M' _journal_name_full 'American Mineralogist' _journal_volume 84 _journal_year 1999 _journal_page_first 1304 _journal_page_last 1318 _publ_section_title ; Hydrothermal synthesis of amphiboles along the tremolite-pargasite join and in the ternary system tremolite-pargasite-cummingtonite Sample: PARG 19-11 ; _database_code_amcsd 0002276 _chemical_formula_sum 'O24 Si6.48 Al2.27 Mg4.55 Ca1.7 Na' _cell_length_a 9.9022 _cell_length_b 17.9747 _cell_length_c 5.2750 _cell_angle_alpha 90 _cell_angle_beta 105.384 _cell_angle_gamma 90 _cell_volume 905.251 _exptl_crystal_density_diffrn 3.041 _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 0.11320 0.08710 0.22580 1.00000 0.01013 O2 0.11420 0.17120 0.72480 1.00000 0.01013 O3 0.10720 0.00000 0.71260 1.00000 0.01013 O4 0.36090 0.24890 0.78140 1.00000 0.01013 O5 0.34960 0.14040 0.11740 1.00000 0.01393 O6 0.33880 0.11260 0.61470 1.00000 0.01393 O7 0.34450 0.00000 0.28040 1.00000 0.01520 Si1 0.28300 0.08490 0.30520 0.81000 0.00507 Al1 0.28300 0.08490 0.30520 0.19000 0.00507 Si2 0.28820 0.17150 0.80810 0.81000 0.00507 Al2 0.28820 0.17150 0.80810 0.19000 0.00507 Mg1 0.00000 0.08840 0.50000 0.85000 0.00760 Al1 0.00000 0.08840 0.50000 0.15000 0.00760 Mg2 0.00000 0.17650 0.50000 0.85000 0.00760 Al2 0.00000 0.17650 0.50000 0.15000 0.00760 Mg3 0.00000 0.00000 0.00000 0.85000 0.00760 Al3 0.00000 0.00000 0.00000 0.15000 0.00760 Ca4 0.00000 0.27990 0.50000 0.85000 0.01140 Mg4 0.00000 0.27990 0.50000 0.15000 0.01140 NaA 0.00000 0.50000 0.00000 1.00000 0.02913