data_global _chemical_name_mineral 'Hennomartinite' loop_ _publ_author_name 'Libowitzky E' 'Armbruster T' _journal_name_full 'American Mineralogist' _journal_volume 81 _journal_year 1996 _journal_page_first 9 _journal_page_last 18 _publ_section_title ; Lawsonite-type phase transitions in hennomartinite, SrMn2[Si2O7](OH)2.H2O T = 245 C ; _database_code_amcsd 0001770 _chemical_formula_sum 'Sr Mn2 Si2 O10 H4' _cell_length_a 6.255 _cell_length_b 9.067 _cell_length_c 13.431 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 761.727 _exptl_crystal_density_diffrn 3.642 _symmetry_space_group_name_H-M 'C m c m' 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' '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 Sr 0.00000 0.31258 0.25000 1.00000 ? Mn 0.25000 0.25000 0.00000 1.00000 ? Si 0.00000 0.96991 0.13224 1.00000 ? O1 0.00000 0.01980 0.25000 1.00000 ? O2 0.28510 0.37230 0.11492 1.00000 ? O3 0.00000 0.12750 0.07680 1.00000 ? O4 0.00000 0.63400 0.04240 1.00000 ? O5 0.02900 0.60680 0.25000 0.50000 ? Hw 0.00000 0.63700 0.19800 1.00000 0.06003 Hh 0.00000 0.55200 0.04600 1.00000 0.09005 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Sr 0.02270 0.02200 0.01440 0.00000 0.00000 0.00000 Mn 0.01090 0.01160 0.01120 -0.00040 0.00010 -0.00270 Si 0.01200 0.00900 0.00820 0.00000 0.00000 0.00000 O1 0.02800 0.02200 0.00770 0.00000 0.00000 0.00000 O2 0.01440 0.01780 0.01640 -0.00390 0.00180 -0.00550 O3 0.02160 0.01150 0.01480 0.00000 0.00000 0.00380 O4 0.01810 0.01270 0.02160 0.00000 0.00000 0.00320 O5 0.05000 0.03700 0.02500 0.00000 0.00000 0.00000