data_9009977 _chemical_name 'Schultenite' loop_ _publ_author_name 'Wilson C C' 'Cox P J' 'Stewart N S' _journal_name_full "Journal of Crystallographic and Spectroscopic Research" _journal_volume 21 _journal_year 1991 _journal_page_first 589 _journal_page_last 593 _publ_section_title ; Structure and disorder in schultenite, lead hydrogen arsenate ; _chemical_formula_sum 'Pb H As O4' _cell_length_a 4.930 _cell_length_b 6.772 _cell_length_c 5.859 _cell_angle_alpha 90 _cell_angle_beta 96.07 _cell_angle_gamma 90 _cell_volume 194.512 _symmetry_space_group_name_H-M 'P 1 2/c 1' loop_ _symmetry_equiv_pos_as_xyz 'x,y,z' 'x,-y,1/2+z' '-x,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_Uiso_or_equiv Pb 0.00000 0.20270 0.25000 1.00000 ? H 0.48400 0.52450 0.48800 0.50000 0.03040 As 0.50000 0.79660 0.25000 1.00000 ? O1 0.35910 0.64940 0.44330 1.00000 ? O2 0.24920 0.93180 0.10890 1.00000 ?