data_global _chemical_name_mineral 'Stichtite' loop_ _publ_author_name 'Mills S J' 'Whitfield P S' 'Wilson S A' 'Woodhouse J N' 'Dipple G M' 'Raudsepp M' 'Francis C A' _journal_name_full 'American Mineralogist' _journal_volume 96 _journal_year 2011 _journal_page_first 179 _journal_page_last 187 _publ_section_title ; The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites Note: Sample 84588, 2H1 polytype of stichtite = barbertonite ; _database_code_amcsd 0018331 _chemical_compound_source 'Barberton, South Africa' _chemical_formula_sum '(Mg.75 Cr.25) O2.984 H3.224 C.124' _cell_length_a 3.09689 _cell_length_b 3.09689 _cell_length_c 15.6193 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 129.731 _exptl_crystal_density_diffrn 2.143 _symmetry_space_group_name_H-M 'P 63/m m c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x,x-y,1/2-z' '-x+y,-x,1/2-z' 'x-y,x,1/2+z' '-y,-x,z' 'y,x,-z' 'y,-x+y,-z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x+y,y,1/2-z' 'x,y,1/2-z' '-x,-y,1/2+z' 'x,x-y,z' '-x,-x+y,-z' 'x-y,x,-z' '-x+y,-x,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,x-y,1/2-z' 'y,-x+y,1/2+z' '-x+y,y,z' 'x-y,-y,-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 Mg 0.00000 0.00000 0.00000 0.75000 0.01013 Cr 0.00000 0.00000 0.00000 0.25000 0.01013 O1 0.33333 0.66667 0.06500 1.00000 0.00811 H1 0.33333 0.66667 0.13100 1.00000 0.00811 Wat2 0.23000 -0.23000 0.25000 0.20400 0.00811 CO3 0.33333 0.66667 0.25000 0.12400 0.00811 O3 0.23000 -0.23000 0.25000 0.12400 0.00811