data_global _chemical_name_mineral 'Natrolite' loop_ _publ_author_name 'Seryotkin Y V' 'Bakakin V V' 'Fursenko B A' 'Belitsky I A' 'Joswig W' 'Radaelli P G' _journal_name_full 'European Journal of Mineralogy' _journal_volume 17 _journal_year 2005 _journal_page_first 305 _journal_page_last 313 _publ_section_title ; Structural evolution of natrolite during over-hydration: a high-pressure neutron diffraction study Note: Zeolite Sample: Khibiny massif, Kola Peninsula, Russia; P = .9 GPa ; _database_code_amcsd 0007098 _chemical_formula_sum '(Na1.92 Mg.06 Ca.02) Al2 Si3 O11.84 D2.96' _cell_length_a 18.2126 _cell_length_b 18.5695 _cell_length_c 6.5741 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 2223.353 _exptl_crystal_density_diffrn 2.271 _symmetry_space_group_name_H-M 'F d d 2' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2+y,1/2+z' '1/2+x,y,1/2+z' '1/2+x,1/2+y,z' '1/4+x,1/4-y,1/4+z' '1/4+x,3/4-y,3/4+z' '3/4+x,1/4-y,3/4+z' '3/4+x,3/4-y,1/4+z' '1/4-x,1/4+y,1/4+z' '1/4-x,3/4+y,3/4+z' '3/4-x,1/4+y,3/4+z' '3/4-x,3/4+y,1/4+z' '-x,1/2-y,1/2+z' '-x,-y,+z' '1/2-x,1/2-y,+z' '1/2-x,-y,1/2+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 Na -0.02540 0.21620 0.38900 0.96000 0.01900 Mg -0.02540 0.21620 0.38900 0.03000 0.01900 Ca -0.02540 0.21620 0.38900 0.01000 0.01900 Al 0.03440 0.09400 0.60900 1.00000 0.00800 Si1 0.00000 0.00000 0.00000 1.00000 0.00700 Si2 -0.09850 0.03700 0.36500 1.00000 0.00300 O1 0.02290 0.06870 0.86600 1.00000 0.00700 O2 0.06950 0.18230 0.61200 1.00000 0.00300 O3 0.09840 0.03530 0.49700 1.00000 0.01800 O4 -0.04760 0.09710 0.46800 1.00000 0.01000 O5 -0.06870 0.02380 0.13700 1.00000 0.03700 Ow6 0.05570 0.19160 0.11100 0.74000 0.01500 D61 0.05200 0.14720 0.05800 0.74000 0.01500 D62 0.10650 0.19010 0.17800 0.74000 0.01500 Ow7* 0.11800 0.35400 0.39900 0.18000 0.01300