data_global
_chemical_name_mineral 'Tremolite'
loop_
_publ_author_name
'Comodi P'
'Mellini M'
'Ungaretti L'
'Zanazzi P F'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 3 
_journal_year 1991
_journal_page_first 485
_journal_page_last 499
_publ_section_title
;
 Compressibility and high pressure structure refinement
 of tremolite, pargasite and glaucophane
 Sample: pressure at 35 kbar
;
_database_code_amcsd 0006414
_chemical_formula_sum '(Mg4.95 Fe.05) Ca2 Si8 O24 H2'
_cell_length_a 9.640
_cell_length_b 17.890
_cell_length_c 5.228
_cell_angle_alpha 90
_cell_angle_beta 105.1
_cell_angle_gamma 90
_cell_volume 870.488
_exptl_crystal_density_diffrn      3.105
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_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
_atom_site_occupancy
_atom_site_U_iso_or_equiv
MgM1   0.00000   0.08700   0.50000   0.99000   0.00590
FeM1   0.00000   0.08700   0.50000   0.01000   0.00590
MgM2   0.00000   0.17470   0.00000   0.99000   0.01000
FeM2   0.00000   0.17470   0.00000   0.01000   0.01000
MgM3   0.00000   0.00000   0.00000   0.99000   0.00640
FeM3   0.00000   0.00000   0.00000   0.01000   0.00640
CaM4   0.00000   0.27680   0.50000   1.00000   0.00440
SiT1   0.28580   0.08400   0.30050   1.00000   0.00330
SiT2   0.28900   0.17160   0.80650   1.00000   0.00540
O1   0.11450   0.08510   0.21700   1.00000   0.00360
O2   0.11630   0.17000   0.72690   1.00000   0.00420
O-H3   0.11100   0.00000   0.71520   1.00000   0.00470
O4   0.36430   0.25030   0.78970   1.00000   0.00540
O5   0.35060   0.13670   0.10580   1.00000   0.00620
O6   0.34720   0.11720   0.59470   1.00000   0.00500
O7   0.34600   0.00000   0.29090   1.00000   0.00590