data_global _chemical_name_mineral 'Kosmochlor' loop_ _publ_author_name 'Secco L' 'Martignago F' 'Dal Negro A' 'Reznitskii L Z' 'Sklyarov E V' _journal_name_full 'American Mineralogist' _journal_volume 87 _journal_year 2002 _journal_page_first 709 _journal_page_last 714 _publ_section_title ; Crystal chemistry of Cr-V-rich clinopyroxenes Sample 1 ; _database_code_amcsd 0002806 _chemical_formula_sum 'Si2 (Cr.478 V.428 Mg.056 Al.033 Ti.003 Fe.001 Mn.001) (Ca.055 Na.945) O6' _cell_length_a 9.6072 _cell_length_b 8.7413 _cell_length_c 5.2771 _cell_angle_alpha 90 _cell_angle_beta 107.172 _cell_angle_gamma 90 _cell_volume 423.413 _exptl_crystal_density_diffrn 3.534 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-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 SiT 0.29165 0.09132 0.23581 1.00000 0.00406 CrM1 0.00000 0.90618 0.25000 0.47800 0.00453 VM1 0.00000 0.90618 0.25000 0.42800 0.00453 MgM1 0.00000 0.90618 0.25000 0.05600 0.00453 AlM1 0.00000 0.90618 0.25000 0.03300 0.00453 TiM1 0.00000 0.90618 0.25000 0.00300 0.00453 FeM1 0.00000 0.90618 0.25000 0.00100 0.00453 MnM1 0.00000 0.90618 0.25000 0.00100 0.00453 CaM2 0.00000 0.30078 0.25000 0.05500 0.01105 NaM2 0.00000 0.30078 0.25000 0.94500 0.01105 O1 0.11430 0.07965 0.13983 1.00000 0.00598 O2 0.36076 0.25718 0.30565 1.00000 0.00766 O3 0.35267 0.01016 0.00964 1.00000 0.00688