data_global _chemical_name_mineral 'Tremolite' 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 23-13 ; _database_code_amcsd 0002280 _chemical_formula_sum 'O24 Si8 Mg5.18 Ca1.82' _cell_length_a 9.809 _cell_length_b 18.054 _cell_length_c 5.2763 _cell_angle_alpha 90 _cell_angle_beta 104.570 _cell_angle_gamma 90 _cell_volume 904.340 _exptl_crystal_density_diffrn 2.965 _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 0.12070 0.08760 0.21290 1.00000 0.01013 O2 0.11020 0.17050 0.71850 1.00000 0.01013 O3 0.11280 0.00000 0.70420 1.00000 0.01013 O4 0.35520 0.24510 0.77960 1.00000 0.01013 O5 0.34380 0.13070 0.09530 1.00000 0.01393 O6 0.34270 0.11540 0.58840 1.00000 0.01393 O7 0.34430 0.00000 0.29740 1.00000 0.01520 Si1 0.28100 0.08400 0.29920 1.00000 0.00507 Si2 0.28690 0.17130 0.80410 1.00000 0.00507 Mg1 0.00000 0.08300 0.50000 1.00000 0.00760 Mg2 0.00000 0.17430 0.00000 1.00000 0.00760 Mg3 0.00000 0.00000 0.00000 1.00000 0.00760 Ca4 0.00000 0.27290 0.50000 0.91000 0.01140 Mg4 0.00000 0.27290 0.50000 0.09000 0.01140