data_global _chemical_name_mineral 'Ardennite-(As)' loop_ _publ_author_name 'Donnay G' 'Allmann R' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 24 _journal_year 1968 _journal_page_first 845 _journal_page_last 855 _publ_section_title ; Si3O10 groups in the crystal structure of ardennite ; _database_code_amcsd 0009340 _chemical_formula_sum 'Mn3.53 Ca.47 Al4.3 Mg Fe.2 Cu.06 Si5 (As.905 V.095) O28 H6' _cell_length_a 8.7126 _cell_length_b 5.8108 _cell_length_c 18.5214 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 937.686 _exptl_crystal_density_diffrn 3.666 _symmetry_space_group_name_H-M 'P n m m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,1/2-z' '-x,-y,1/2+z' 'x,1/2-y,z' '-x,1/2+y,-z' '-x,1/2+y,1/2+z' 'x,1/2-y,1/2-z' '-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 Mn1 0.94410 0.25000 0.15540 0.76500 0.01203 Ca1 0.94410 0.25000 0.15540 0.23500 0.01203 Mn2 0.39560 0.75000 0.16000 1.00000 0.01203 Al1 0.00000 0.00000 0.00000 1.00000 0.00785 Al2 0.50000 0.00000 0.00000 1.00000 0.00963 Mg 0.67870 -0.00160 0.25000 0.50000 0.01216 Al 0.67870 -0.00160 0.25000 0.15000 0.01216 Fe 0.67870 -0.00160 0.25000 0.10000 0.01216 Cu 0.67870 -0.00160 0.25000 0.03000 0.01216 Si1 0.76410 0.75000 0.09700 1.00000 0.00469 Si2 0.27660 0.25000 0.09510 1.00000 0.00747 Si3 0.34120 0.25000 0.25000 1.00000 0.00836 As 0.04260 0.75000 0.25000 0.90500 0.00570 V 0.04260 0.75000 0.25000 0.09500 0.00570 O1 0.12840 0.02650 -0.08280 1.00000 0.01039 O2 0.62410 -0.02070 -0.08330 1.00000 0.01026 O3 0.11270 0.25000 0.05260 1.00000 0.01089 O4 0.61690 0.75000 0.04150 1.00000 0.02419 O5 0.92990 -0.00680 0.25000 1.00000 0.01292 O6 0.44310 0.01460 0.25000 1.00000 0.01343 O7 0.68170 0.75000 0.17760 1.00000 0.00241 O8 0.22320 0.25000 0.18050 1.00000 0.02254 O9 0.15400 0.75000 0.17630 1.00000 0.00456 O-H1 0.11280 0.75000 0.03230 1.00000 0.01203 O-H2 0.61490 0.25000 0.03560 1.00000 0.00443 O-H3 0.69730 0.25000 0.18170 1.00000 0.01153