data_global _chemical_name_mineral 'Phengite-3T' loop_ _publ_author_name 'Ivaldi G' 'Ferraris G' 'Curetti N' 'Compagnoni R' _journal_name_full 'European Journal of Mineralogy' _journal_volume 13 _journal_year 2001 _journal_page_first 1025 _journal_page_last 1034 _publ_section_title ; Coexisting 3T and 2M_1 polytypes of phengite from Cima Pal (Val Savenca, western Alps): Chemical and polytypic zoning and structural characterisation Sample: 3TG ; _database_code_amcsd 0006913 _chemical_compound_source 'Cima Pal, Val Savenca, western Alps' _chemical_formula_sum 'K.95 Na.01 Al1.9 Mg.34 Fe.27 Ti.03 Si3.5 O12 H2' _cell_length_a 5.228 _cell_length_b 5.228 _cell_length_c 29.73 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 703.715 _exptl_crystal_density_diffrn 2.872 _symmetry_space_group_name_H-M 'P 31 1 2' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x+y,y,1/3-z' '-y,x-y,1/3+z' '-y,-x,2/3-z' '-x+y,-x,2/3+z' 'x,x-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 KI 0.12690 0.25390 0.16667 0.95000 0.02610 NaI 0.12690 0.25390 0.16667 0.01000 0.02610 AlM2 0.79870 0.89940 0.00000 0.70000 0.00860 MgM2 0.79870 0.89940 0.00000 0.17000 0.00860 FeM2 0.79870 0.89940 0.00000 0.13500 0.00860 TiM2 0.79870 0.89940 0.00000 0.01500 0.00860 AlM3 0.45350 0.22680 0.00000 0.70000 0.01140 MgM3 0.45350 0.22680 0.00000 0.17000 0.01140 FeM3 0.45350 0.22680 0.00000 0.13500 0.01140 TiM3 0.45350 0.22680 0.00000 0.01500 0.01140 SiT1 0.78630 0.58090 0.09037 0.87500 0.00880 AlT1 0.78630 0.58090 0.09037 0.12500 0.00880 SiT2 0.46800 0.92100 0.09037 0.87500 0.00810 AlT2 0.46800 0.92100 0.09037 0.12500 0.00810 O1 0.64770 0.76960 0.11300 1.00000 0.01600 O2 0.12600 0.72380 0.10790 1.00000 0.01770 O3 0.60470 0.25010 0.11250 1.00000 0.01710 O4 0.75300 0.56720 0.03610 1.00000 0.01470 O5 0.49890 0.93600 0.03620 1.00000 0.01320 O6 0.12220 0.19110 0.03520 1.00000 0.01920 H 0.15000 0.32000 0.03600 1.00000 0.04000