data_global _chemical_name_mineral 'Sarkinite' loop_ _publ_author_name 'Dal Negro A' 'Giuseppetti G' 'Pozas J M M' _journal_name_full 'Tschermaks Mineralogische und Petrographische Mitteilungen' _journal_volume 21 _journal_year 1974 _journal_page_first 246 _journal_page_last 260 _publ_section_title ; The crystal structure of sarkinite, Mn2AsO4(OH) ; _database_code_amcsd 0015650 _chemical_formula_sum 'Mn2 As O5 H' _cell_length_a 12.779 _cell_length_b 13.596 _cell_length_c 10.208 _cell_angle_alpha 90 _cell_angle_beta 108.88 _cell_angle_gamma 90 _cell_volume 1678.151 _exptl_crystal_density_diffrn 4.208 _symmetry_space_group_name_H-M 'P 1 21/a 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,z' '1/2-x,1/2+y,-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Mn1 0.10010 0.93080 0.47330 0.00418 Mn2 0.08680 0.42700 0.45100 0.00355 Mn3 0.38940 0.32280 0.02670 0.00431 Mn4 0.42160 0.82010 0.04220 0.00355 Mn5 0.19770 0.00310 0.21700 0.00519 Mn6 0.18860 0.52030 0.19270 0.00393 Mn7 0.30230 0.24890 0.28750 0.00494 Mn8 0.31660 0.73100 0.30250 0.00418 As1 0.42470 0.07142 0.12113 0.00063 As2 0.42541 0.57604 0.11348 0.00013 As3 0.07649 0.17874 0.37906 0.00013 As4 0.07540 0.67531 0.38360 0.00051 O1 0.17600 0.15190 0.30970 0.00646 O2 0.17710 0.64070 0.32230 0.00671 O3 0.33390 0.09500 0.20310 0.00798 O4 0.32020 0.61450 0.16650 0.00583 O5 0.43070 0.16190 0.00790 0.00545 O6 0.45910 0.66660 0.02220 0.00608 O7 0.45880 0.29320 0.25240 0.00443 O8 0.45980 0.79340 0.25510 0.00722 O9 0.12050 0.27620 0.48750 0.00722 O10 0.12080 0.77150 0.48990 0.00735 O11 0.05900 0.08830 0.48450 0.00519 O12 0.04680 0.58150 0.47230 0.00684 O13 0.05020 0.44740 0.23610 0.00684 O14 0.03390 0.95700 0.24660 0.00773 O15 0.37670 0.48010 0.00490 0.00684 O16 0.38280 0.97140 0.01740 0.00722 O-H17 0.25410 0.97080 0.43850 0.00621 O-H18 0.30040 0.41640 0.30680 0.00735 O-H19 0.20780 0.83890 0.19620 0.00823 O-H20 0.23960 0.27820 0.06710 0.00785