data_9000375
_chemical_name 'Tremolite'
loop_
_publ_author_name
'Cameron M'
'Gibbs G V'
_journal_name_full "American Mineralogist"
_journal_volume 58
_journal_year 1973
_journal_page_first 879
_journal_page_last 888
_publ_section_title
;
 The crystal structure and bonding of fluor-tremolite: A comparison with hydroxy
 tremolite
;
_chemical_formula_sum 'Si8 Mg5 Ca2 O22 F2'
_cell_length_a 9.787
_cell_length_b 18.004
_cell_length_c 5.263
_cell_angle_alpha 90
_cell_angle_beta 104.44
_cell_angle_gamma 90
_cell_volume 898.071
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-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
Si1   0.28290   0.08340   0.29600
Si2   0.29000   0.17070   0.80410
Mg1   0.00000   0.08850   0.50000
Mg2   0.00000   0.17600   0.00000
Mg3   0.00000   0.00000   0.00000
Ca4   0.00000   0.27710   0.50000
O1   0.11260   0.08470   0.21790
O2   0.11870   0.17020   0.72390
F3   0.10200   0.00000   0.71240
O4   0.36440   0.24840   0.79070
O5   0.34710   0.13510   0.10010
O6   0.34440   0.11970   0.58570
O7   0.34080   0.00000   0.29220