LMucko/crystallography-open-database huggingface dataset:
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: 12BA, from Bloom Lake, Quebec, Canada in an iron formation
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001932
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: 12BA, from Bloom Lake, Quebec, Canada in an iron formation
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
'Al0.08 Ca1.824 Fe2.711 H1.88 K0.016 Mg2.395 Mn0.04 Na0.12 O24 Si7.92 Ti0.002'
_chemical_name_mineral           Actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.61
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.886
_cell_length_b                   18.171
_cell_length_c                   5.297
_cell_volume                     920.777
_database_code_amcsd             0001993
_exptl_crystal_density_diffrn    3.242
_cod_original_formula_sum
'Fe2.711 Mn.04 Mg2.395 Ti.002 Ca1.824 Na.12 Si7.92 Al.08 K.016 H1.88 O24'
_cod_database_code               9001932
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: C60, 12BA, from Bloom Lake, Quebec, Canada in an iron formation after heating at 700 C
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001933
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: C60, 12BA, from Bloom Lake, Quebec, Canada in an iron formation
 after heating at 700 C
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
;Al0.072 Ca1.872 Cl0.02 F0.048 Fe2.673 H1.886 K0.004 Mg2.405 Mn0.042 Na0.096
 O23.932 Si7.928
;
_chemical_name_mineral           Actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.63
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.900
_cell_length_b                   18.198
_cell_length_c                   5.299
_cell_volume                     923.716
_database_code_amcsd             0001994
_exptl_crystal_density_diffrn    3.230
_exptl_crystal_thermal_history   'after heating at 700 C'
_cod_original_formula_sum
;Fe2.673 Mn.042 Mg2.405 Ca1.872 Na.096 Si7.928 Al.072 K.004 H1.886 O23.932
 F.048 Cl.02
;
_cod_database_code               9001933
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: AMNH 44973, from Cumberland, Rhode Island in a quartzite
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001934
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: AMNH 44973, from Cumberland, Rhode Island in a quartzite
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
;Al0.294 Ca1.772 F0.048 Fe2.757 H1.836 K0.022 Mg2.049 Mn0.316 Na0.192 O23.952
 Si7.756 Ti0.004
;
_chemical_name_mineral           Actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.60
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.884
_cell_length_b                   18.189
_cell_length_c                   5.302
_cell_volume                     922.415
_database_code_amcsd             0001995
_exptl_crystal_density_diffrn    3.274
_cod_original_cell_volume        922.414
_cod_original_formula_sum
;Fe2.757 Mn.316 Mg2.049 Al.294 Ti.004 Ca1.772 Na.192 Si7.756 K.022 H1.836
 O23.952 F.048
;
_cod_database_code               9001934
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: C59, AMNH 44973, from Cumberland, Rhode Island in a quartzite after heating at 700 C
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001935
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: C59, AMNH 44973, from Cumberland, Rhode Island in a quartzite
 after heating at 700 C
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
;Al0.282 Ca1.736 F0.048 Fe2.823 H1.894 K0.024 Mg1.979 Mn0.336 Na0.176 O23.952
 Si7.792 Ti0.006
;
_chemical_name_mineral           Actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.62
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.890
_cell_length_b                   18.194
_cell_length_c                   5.306
_cell_volume                     923.841
_database_code_amcsd             0001996
_exptl_crystal_density_diffrn    3.277
_exptl_crystal_thermal_history   'after heating at 700 C'
_cod_original_formula_sum
;Fe2.823 Mn.336 Mg1.979 Al.282 Ti.006 Ca1.736 Na.176 Si7.792 K.024 H1.894
 O23.952 F.048
;
_cod_database_code               9001935
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: ID4-4C, from Isua Belt, East Greenland, in an iron formation
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001936
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: ID4-4C, from Isua Belt, East Greenland, in an iron formation
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
;Al0.024 Ca1.814 Cl0.03 F0.01 Fe3.112 H1.86 Mg1.954 Mn0.088 Na0.018 O23.96
 Si7.988 Ti0.002
;
_chemical_name_mineral           Actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.59
_cell_angle_gamma                90
_cell_length_a                   9.908
_cell_length_b                   18.218
_cell_length_c                   5.301
_cell_formula_units_Z            2
_cell_volume                     925.996
_database_code_amcsd             0001997
_exptl_crystal_density_diffrn    3.267
_cod_original_formula_sum
;Fe3.112 Mn.088 Mg1.954 Al.024 Ti.002 Ca1.814 Na.018 Si7.988 H1.86 O23.96 F.01
 Cl.03
;
_cod_database_code               9001936
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: C51, ID4-4C, from Isua Belt, East Greenland, in an iron formation after heating at 700 C
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001937
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: C51, ID4-4C, from Isua Belt, East Greenland, in an iron formation
 after heating at 700 C
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
;Al0.028 Ca1.814 Cl0.026 F0.048 Fe3.17 H1.872 K0.004 Mg1.906 Mn0.092 Na0.038
 O23.926 Si7.972
;
_chemical_name_mineral           Actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.64
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.903
_cell_length_b                   18.211
_cell_length_c                   5.299
_cell_volume                     924.614
_database_code_amcsd             0001998
_exptl_crystal_density_diffrn    3.281
_exptl_crystal_thermal_history   'after heating at 700 C'
_cod_original_formula_sum
;Fe3.17 Mn.092 Mg1.906 Ca1.814 Na.038 Si7.972 Al.028 K.004 H1.872 O23.926
 F.048 Cl.026
;
_cod_database_code               9001937
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: NMNH 168215, from Goose Creek Quarry, Leesburg, Virginia, in an alteration of hornblende
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001938
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: NMNH 168215, from Goose Creek Quarry, Leesburg, Virginia,
 in an alteration of hornblende
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
'Al0.02 Ca1.97 Fe3.98 H1.88 K0.044 Mg0.88 Mn0.196 Na0.028 O24 Si7.98 Ti0.002'
_chemical_name_mineral           Ferro-actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.81
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.977
_cell_length_b                   18.287
_cell_length_c                   5.308
_cell_volume                     936.269
_database_code_amcsd             0001999
_exptl_crystal_density_diffrn    3.357
_cod_original_formula_sum
'Fe3.98 Mn.196 Mg.88 Ti.002 Ca1.97 Na.028 Si7.98 Al.02 K.044 H1.88 O24'
_cod_database_code               9001938
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature Sample: C80, NMNH 168215, from Goose Creek Quarry, Leesburg, Virginia, in an alteration of hornblende, after heating at 700 C
Evans, B. W.; Yang, H.; American Mineralogist 83 (1998) 458–475; doi:

data_9001939
_publ_section_title
;
 Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient
 and high temperature
 Sample: C80, NMNH 168215, from Goose Creek Quarry, Leesburg, Virginia,
 in an alteration of hornblende, after heating at 700 C
;
_journal_name_full               'American Mineralogist'
_journal_page_first              458
_journal_page_last               475
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
;Al0.02 Ca1.952 Cl0.006 F0.01 Fe4.104 H1.868 K0.048 Mg0.742 Mn0.18 Na0.024 O24
 Si7.98 Ti0.004
;
_chemical_name_mineral           Ferro-actinolite
_space_group_IT_number           12
_symmetry_space_group_name_Hall  '-C 2y'
_symmetry_space_group_name_H-M   'C 1 2/m 1'
_cell_angle_alpha                90
_cell_angle_beta                 104.79
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.986
_cell_length_b                   18.296
_cell_length_c                   5.306
_cell_volume                     937.308
_database_code_amcsd             0002000
_exptl_crystal_density_diffrn    3.361
_exptl_crystal_thermal_history   'after heating at 700 C'
_cod_original_formula_sum
;Fe4.104 Mn.18 Mg.742 Ti.004 Ca1.952 Na.024 Si7.98 Al.02 K.048 H1.868 O24 F.01
 Cl.006
;
_cod_database_code               9001939
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample from Lady Hill
Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C.; American Mineralogist 83 (1998) 590–606; doi:

data_9001940
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample from Lady Hill
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum            'Al3.66 Ca2 H54.096 K O50.85 Si14.34'
_chemical_name_mineral           Erionite-Ca
_space_group_IT_number           194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   13.339
_cell_length_b                   13.339
_cell_length_c                   15.112
_cell_volume                     2328.623
_database_code_amcsd             0002001
_exptl_crystal_density_diffrn    2.123
_cod_original_formula_sum        '(Si14.34 Al3.66) Ca2 K O50.85 H54.096'
_cod_database_code               9001940
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample from Shourdo
Gualtieri A; Artioli G; Passaglia E; Bigi S; Viani A; Hanson J C; American Mineralogist 83 (1998) 590–606; doi:

data_9001941
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample from Shourdo
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
'Al3.954 Ca1.22 H72.096 K6 Mg0.26 O49.2 Si14.046'
_chemical_name_mineral           Erionite-Ca
_space_group_IT_number           194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   13.264
_cell_length_b                   13.264
_cell_length_c                   15.067
_cell_formula_units_Z            2
_cell_volume                     2295.654
_cod_original_formula_sum
'(Si14.046 Al3.954) Ca1.22 Mg.26 K6 O49.2 H72.096'
_cod_database_code               9001941
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample from Tunguska
Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C.; American Mineralogist 83 (1998) 590–606; doi:

data_9001942
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample from Tunguska
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum            'Al4.254 Ca1.8 H49.746 K0.85 O51.36 Si13.746'
_chemical_name_mineral           Erionite-Ca
_space_group_IT_number           194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   13.304
_cell_length_b                   13.304
_cell_length_c                   15.078
_cell_volume                     2311.207
_database_code_amcsd             0002003
_exptl_crystal_density_diffrn    2.124
_cod_original_formula_sum        '(Si13.746 Al4.254) Ca1.8 K.85 O51.36 H49.746'
_cod_database_code               9001942
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample from Agate Beach
Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C.; American Mineralogist 83 (1998) 590–606; doi:

data_9001943
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample from Agate Beach
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
'Al4.11 Ca1.36 H16.092 K0.87 Mg0.4 O53.58 Si13.89'
_chemical_name_mineral           Erionite-Ca
_space_group_IT_number           194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   13.289
_cell_length_b                   13.289
_cell_length_c                   15.079
_cell_volume                     2306.151
_database_code_amcsd             0002004
_exptl_crystal_density_diffrn    2.121
_cod_original_formula_sum
'(Si13.89 Al4.11) Ca1.36 Mg.4 K.87 O53.58 H16.092'
_cod_database_code               9001943
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample from Mt. Semiol
Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C.; American Mineralogist 83 (1998) 590–606; doi:

data_9001944
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample from Mt. Semiol
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum            'Al5.22 Ca1.4 H25.678 K Mg O49.52 Si12.78'
_chemical_name_mineral           Offretite
_space_group_IT_number           187
_symmetry_space_group_name_Hall  'P -6 2'
_symmetry_space_group_name_H-M   'P -6 m 2'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            1
_cell_length_a                   13.293
_cell_length_b                   13.293
_cell_length_c                   7.608
_cell_volume                     1164.252
_database_code_amcsd             0002005
_exptl_crystal_density_diffrn    2.050
_cod_original_formula_sum        '(Si12.78 Al5.22) Ca1.4 K Mg O49.52 H25.678'
_cod_database_code               9001944
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample #1 from Fitta
Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C.; American Mineralogist 83 (1998) 590–606; doi:

data_9001945
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample #1 from Fitta
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
'Al5.4 Ca1.52 H19.678 K0.96 Mg0.97 O51.5 Si12.6'
_chemical_name_mineral           Offretite
_space_group_IT_number           187
_symmetry_space_group_name_Hall  'P -6 2'
_symmetry_space_group_name_H-M   'P -6 m 2'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            1
_cell_length_a                   13.390
_cell_length_b                   13.390
_cell_length_c                   7.598
_cell_volume                     1179.753
_database_code_amcsd             0002006
_exptl_crystal_density_diffrn    2.063
_cod_original_formula_sum
'(Si12.6 Al5.4) Ca1.52 K.96 Mg.97 O51.5 H19.678'
_cod_database_code               9001945
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite Sample #2 from Fitta
Gualtieri, A.; Artioli, G.; Passaglia, E.; Bigi, S.; Viani, A.; Hanson, J. C.; American Mineralogist 83 (1998) 590–606; doi:

data_9001946
_publ_section_title
;
 Crystal structure-crystal chemistry relationships in the zeolites erionite
 and offretite
 Sample #2 from Fitta
;
_journal_name_full               'American Mineralogist'
_journal_page_first              590
_journal_page_last               606
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum            'Al5.4 Ca1.5 H4.166 K0.89 Mg0.86 O52.07 Si12.6'
_chemical_name_mineral           Offretite
_space_group_IT_number           187
_symmetry_space_group_name_Hall  'P -6 2'
_symmetry_space_group_name_H-M   'P -6 m 2'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            1
_cell_length_a                   13.308
_cell_length_b                   13.308
_cell_length_c                   7.597
_cell_volume                     1165.194
_database_code_amcsd             0002007
_exptl_crystal_density_diffrn    2.070
_cod_original_formula_sum        '(Si12.6 Al5.4) Ca1.5 K.89 Mg.86 O52.07 H4.166'
_cod_database_code               9001946
Tschortnerite, a copper-bearing zeolite from the Bellberg volcano, Eifel, Germany
Effenberger, H.; Giester, G.; Krause, W.; Bernhardt, H. J.; American Mineralogist 83 (1998) 607–617; doi:

data_9001947
_publ_section_title
;
 Tschortnerite, a copper-bearing zeolite from the Bellberg volcano, Eifel,
 Germany
;
_journal_name_full               'American Mineralogist'
_journal_page_first              607
_journal_page_last               617
_journal_volume                  83
_journal_year                    1998
_chemical_formula_sum
'Al48 Ba1.2 Ca22.48 Cl0.224 Cu12 H524 K2.88 O305.862 Si48 Sr4.32'
_chemical_name_mineral           Tschortnerite
_space_group_IT_number           225
_symmetry_space_group_name_Hall  '-F 4 2 3'
_symmetry_space_group_name_H-M   'F m -3 m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   31.62
_cell_length_b                   31.62
_cell_length_c                   31.62
_cell_volume                     31614.448
_database_code_amcsd             0002008
_exptl_crystal_density_diffrn    2.183
_cod_original_cell_volume        31614.451
_cod_original_sg_symbol_H-M      'F m 3 m'
_cod_original_formula_sum
'Ca22.48 Sr4.32 K2.88 Ba1.2 Cu12 (Si48 Al48) O305.862 Cl.224 H524'
_cod_database_code               9001947
Sodium heptasilicate: A high-pressure silicate with six-membered rings of tetrahedra interconnected by SiO6 octahedra: (Na8Si[Si6O18])
Fleet, M. E.; American Mineralogist 83 (1998) 618–624; doi:

data_9001948
_publ_section_title
;
 Sodium heptasilicate: A high-pressure silicate with six-membered rings of
 tetrahedra interconnected by SiO6 octahedra: (Na8Si[Si6O18])
;
_journal_name_full               'American Mineralogist'
_journal_page_first              618
_journal_page_last               624
_journal_volume                  83
_journal_year                    1998
_chemical_formula_structural     Na8Si[Si6O18]
_chemical_formula_sum            'Na8 O18 Si7'
_space_group_IT_number           148
_symmetry_space_group_name_Hall  '-P 3*'
_symmetry_space_group_name_H-M   'R -3 :R'
_cell_angle_alpha                87.26
_cell_angle_beta                 87.26
_cell_angle_gamma                87.26
_cell_length_a                   7.180
_cell_length_b                   7.180
_cell_length_c                   7.180
_cell_formula_units_Z            1
_cell_volume                     368.916
_database_code_amcsd             0002009
_exptl_crystal_density_diffrn    3.009
_cod_original_sg_symbol_H-M      'R -3'
_cod_original_formula_sum        'Na8 Si7 O18'
_cod_database_code               9001948
_amcsd_formula_title             Na8Si[Si6O18]