data_global _chemical_name_mineral 'Dravite' loop_ _publ_author_name 'Bosi F' 'Lucchesi S' _journal_name_full 'European Journal of Mineralogy' _journal_volume 16 _journal_year 2004 _journal_page_first 335 _journal_page_last 344 _publ_section_title ; Crystal chemistry of the schorl-dravite series Note: Tourmaline TM507e ; _database_code_amcsd 0007039 _chemical_compound_source 'Olkhon (Lake Baikal), Siberia' _chemical_formula_sum 'Na.479 Ca.335 K.01 Mg2.715 Al5.628 V.504 Cr.159 Ti.039 Fe.003 Si5.952 B3 O30.946 F.054 H3.507' _cell_length_a 15.9521 _cell_length_b 15.9521 _cell_length_c 7.2167 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1590.395 _exptl_crystal_density_diffrn 3.063 _symmetry_space_group_name_H-M 'R 3 m' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' 'x,x-y,z' '2/3+x,1/3+x-y,1/3+z' '1/3+x,2/3+x-y,2/3+z' '-y,-x,z' '2/3-y,1/3-x,1/3+z' '1/3-y,2/3-x,2/3+z' '-x+y,y,z' '2/3-x+y,1/3+y,1/3+z' '1/3-x+y,2/3+y,2/3+z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy NaX 0.00000 0.00000 0.22631 0.47900 CaX 0.00000 0.00000 0.22631 0.33500 KX 0.00000 0.00000 0.22631 0.01000 MgY 0.12365 0.06182 0.63529 0.52700 AlY 0.12365 0.06182 0.63529 0.28600 V3+Y 0.12365 0.06182 0.63529 0.15200 Cr3+Y 0.12365 0.06182 0.63529 0.02100 Ti4+Y 0.12365 0.06182 0.63529 0.01300 Fe2+Y 0.12365 0.06182 0.63529 0.00100 AlZ 0.29790 0.26163 0.61160 0.78700 MgZ 0.29790 0.26163 0.61160 0.18900 Cr3+Z 0.29790 0.26163 0.61160 0.01600 V3+Z 0.29790 0.26163 0.61160 0.00800 SiT 0.19160 0.18980 0.00000 0.99200 AlT 0.19160 0.18980 0.00000 0.00800 B 0.10971 0.21942 0.45363 1.00000 O-H1W 0.00000 0.00000 0.77109 0.50700 O1W 0.00000 0.00000 0.77109 0.43900 F1W 0.00000 0.00000 0.77109 0.05400 O2 0.06051 0.12102 0.48275 1.00000 O-H3V 0.26302 0.13151 0.51130 1.00000 O4 0.09276 0.18552 0.07190 1.00000 O5 0.18264 0.09132 0.09212 1.00000 O6 0.19470 0.18511 0.77832 1.00000 O7 0.28484 0.28432 0.07900 1.00000 O8 0.20901 0.26981 0.44055 1.00000