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: 3R1 polytype of stichtite ; _database_code_amcsd 0018330 _chemical_compound_source 'Tasmania, Australia' _chemical_formula_sum '(Mg.77 Cr.23) O2.966 H3.224 C.118' _cell_length_a 3.09552 _cell_length_b 3.09552 _cell_length_c 23.5042 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 195.049 _exptl_crystal_density_diffrn 2.115 _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' '-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' '-x,-y,-z' '2/3-x,1/3-y,1/3-z' '1/3-x,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 _atom_site_U_iso_or_equiv Mg 0.00000 0.00000 0.00000 0.77000 0.00203 Cr 0.00000 0.00000 0.00000 0.23000 0.00203 O1 0.33333 0.66667 0.37268 1.00000 0.00051 H1 0.33333 0.66667 0.41108 1.00000 0.00051 Wat2 0.12420 -0.12420 0.50000 0.10200 0.00025 CO3 0.33333 0.66667 0.50000 0.05900 0.00025 O3 0.12420 -0.12420 0.50000 0.05900 0.00025