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data_66137-ICSD
_database_code_ICSD 66137
_audit_creation_date 1992-01-20
_audit_update_record 2015-02-01
_chemical_name_common 'Lithium tecto-alumosilicate'
_chemical_formula_structural 'Li (Al Si O4)'
_chemical_formula_sum 'Al1 Li1 O4 Si1'
_chemical_name_mineral "'Eucryptite gamma'"
_exptl_crystal_density_diffrn 2.56
_citation_title

;
Thermal transformation of zeolite Li-A(BW). The crystal structure of
gamma-eucryptite, a polymorph of Li Al Si O4
;
loop_
_citation_id
_citation_journal_full
_citation_year
_citation_journal_volume
_citation_page_first
_citation_page_last
_citation_journal_id_ASTM
primary Zeolites 1990 10 193 199 ZEOLD3
loop_
_citation_author_citation_id
_citation_author_name
primary 'Norby, P.'
_cell_length_a 8.228(2)
_cell_length_b 5.032(1)
_cell_length_c 8.274(1)
_cell_angle_alpha 90.
_cell_angle_beta 107.46(1)
_cell_angle_gamma 90.
_cell_volume 326.79
_cell_formula_units_Z 4
_space_group_name_H-M_alt 'P 1 a 1'
_space_group_IT_number 7
loop_
_space_group_symop_id
_space_group_symop_operation_xyz
1 'x+1/2, -y, z'
2 'x, y, z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
Si4+ 4
Al3+ 3
O2- -2
Li1+ 1
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_B_iso_or_equiv
_atom_site_occupancy
Si1 Si4+ 2 a 0.5 0.319(2) 0.25 0.1(2) 1.
Si2 Si4+ 2 a -0.155(1) 0.191(2) -0.262(1) 0.1(2) 1.
Al1 Al3+ 2 a 0.375(1) 0.830(2) 0.368(1) 0.1(2) 1.
Al2 Al3+ 2 a -0.268(1) -0.318(2) -0.126(1) 0.1(2) 1.
O1 O2- 2 a 0.674(1) 0.189(3) 0.225(2) 0.8(4) 1.
O2 O2- 2 a 0.366(2) 0.272(2) 0.073(2) 0.8(4) 1.
O3 O2- 2 a 0.440(2) 0.175(2) 0.401(1) 0.8(4) 1.
O4 O2- 2 a 0.518(2) 0.641(2) 0.292(1) 0.8(4) 1.
O5 O2- 2 a -0.298(2) 0.358(2) -0.209(2) 0.8(4) 1.
O6 O2- 2 a 0.025(1) 0.225(3) -0.113(2) 0.8(4) 1.
O7 O2- 2 a -0.161(2) 0.296(2) -0.452(2) 0.8(4) 1.
O8 O2- 2 a -0.205(2) -0.135(2) -0.274(2) 0.8(4) 1.
Li1 Li1+ 2 a 0.279(4) 0.337(6) 0.511(4) 2.0(5) 1.
Li2 Li1+ 2 a 0.563(3) 0.162(6) -0.045(3) 2.0(5) 1.
#End of TTdata_66137-ICSD