data_global _chemical_name_mineral 'Chesterite' loop_ _publ_author_name 'Veblen D R' 'Burnham C W' _journal_name_full 'American Mineralogist' _journal_volume 63 _journal_year 1978 _journal_page_first 1053 _journal_page_last 1073 _publ_section_title ; New biopyriboles from Chester, Vermont: II. The crystal chemistry of jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica reaction ; _database_code_amcsd 0000689 _chemical_formula_sum '(Mg12.82 Fe4.18) Si20 O60 H6' _cell_length_a 18.614 _cell_length_b 45.306 _cell_length_c 5.297 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 4467.097 _exptl_crystal_density_diffrn 3.082 _symmetry_space_group_name_H-M 'A 21 m a' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2+y,1/2+z' '1/2+x,y,-z' '1/2+x,1/2+y,1/2-z' 'x,-y,z' 'x,1/2-y,1/2+z' '1/2+x,-y,-z' '1/2+x,1/2-y,1/2-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 MgMT1 0.12670 0.26750 0.14610 0.91000 0.00481 FeMT1 0.12670 0.26750 0.14610 0.09000 0.00481 MgMT2 0.12240 0.30130 0.64130 0.81100 0.01039 FeMT2 0.12240 0.30130 0.64130 0.18900 0.01039 MgMT3 0.12640 0.33570 0.14580 0.91600 0.00380 FeMT3 0.12640 0.33570 0.14580 0.08400 0.00380 MgMT4 0.12430 0.37150 0.64230 0.97200 0.00418 FeMT4 0.12430 0.37150 0.64230 0.02800 0.00418 FeMT5 0.12330 0.40440 0.14140 0.80500 0.00519 MgMT5 0.12330 0.40440 0.14140 0.19500 0.00519 MgMD1 0.37710 0.46540 0.64430 0.94300 0.00380 FeMD1 0.37710 0.46540 0.64430 0.05700 0.00380 MgMD2 0.37490 0.42960 0.14890 0.98300 0.00418 FeMD2 0.37490 0.42960 0.14890 0.01700 0.00418 MgMD3 0.37180 0.50000 0.14850 0.78600 0.01039 FeMD3 0.37180 0.50000 0.14850 0.21400 0.01039 MgMD4 0.37520 0.39630 0.64570 0.28700 0.00519 FeMD4 0.37520 0.39630 0.64570 0.71300 0.00519 SiT1A 0.27040 0.26680 0.80900 1.00000 0.00456 SiT2A 0.26910 0.33440 0.81690 1.00000 0.00557 SiT3A 0.27320 0.36820 0.31680 1.00000 0.00545 SiT1B 0.48110 0.26700 0.51840 1.00000 0.00621 SiT2B 0.48160 0.33340 0.52450 1.00000 0.00443 SiT3B 0.47550 0.36780 0.02790 1.00000 0.00545 SiD1A 0.23020 0.46630 0.32030 1.00000 0.00557 SiD2A 0.22820 0.43230 0.81250 1.00000 0.00545 SiD1B 0.52010 0.46640 0.97960 1.00000 0.00443 SiD2B 0.52440 0.43360 0.47870 1.00000 0.00545 OT1A 0.29900 0.24990 0.56160 1.00000 -0.00038 OT2A 0.18230 0.26720 0.81120 1.00000 -0.00076 OT3A 0.29760 0.30020 0.80010 1.00000 0.00937 OT4A 0.18170 0.33500 0.81200 1.00000 0.00874 OT5A 0.29920 0.34900 0.07500 1.00000 0.01165 OT6A 0.30230 0.35210 0.58060 1.00000 0.01153 OT7A 0.18360 0.36940 0.31300 1.00000 0.00811 OT8A 0.31330 0.39820 0.33170 1.00000 0.00469 OT1B 0.45230 0.24680 0.27770 1.00000 0.01229 OT2B 0.56450 0.26640 0.51910 1.00000 0.00355 OT3B 0.45030 0.30010 0.48410 1.00000 0.00494 OT4B 0.56670 0.33490 0.52340 1.00000 0.00646 OT5B 0.44970 0.35510 0.30100 1.00000 0.00545 OT6B 0.45050 0.34540 0.79450 1.00000 0.00874 OT7B 0.55990 0.36880 0.03260 1.00000 0.00785 OT8B 0.43450 0.39800 0.96450 1.00000 0.00861 O-HTA 0.18350 0.30050 0.30860 1.00000 0.00747 O-HTB 0.56950 0.30150 0.01810 1.00000 0.00557 OD1A 0.31540 0.46470 0.31010 1.00000 0.00874 OD2A 0.31190 0.43160 0.82010 1.00000 0.00811 OD4A 0.18580 0.40040 0.82810 1.00000 0.00469 OD5A 0.20090 0.45220 0.57700 1.00000 0.01165 OD6A 0.19740 0.44760 0.08040 1.00000 0.01153 OD7A 0.20170 0.50000 0.30640 1.00000 0.00937 OD1B 0.42940 0.46530 0.98040 1.00000 0.00646 OD2B 0.43570 0.43090 0.47380 1.00000 0.00785 OD4B 0.56840 0.40350 0.53670 1.00000 0.00861 OD5B 0.55130 0.44570 0.19950 1.00000 0.00545 OD6B 0.54800 0.45530 0.70280 1.00000 0.00874 OD7B 0.54420 0.50000 0.02680 1.00000 0.00494 O-HDA 0.31870 0.50000 0.81170 1.00000 0.00747 O-HDB 0.43370 0.50000 0.47780 1.00000 0.00557