data_global
_chemical_name_mineral 'Tremolite'
loop_
_publ_author_name
'Yang H'
'Evans B W'
_journal_name_full 'American Mineralogist'
_journal_volume 81 
_journal_year 1996
_journal_page_first 1117
_journal_page_last 1125
_publ_section_title
;
 X-ray structure refinements of tremolite at 140 and 295 K: Crystal chemistry and
 petrologic implications
 T = 140 K
;
_database_code_amcsd 0001835
_chemical_formula_sum 'Mg5 Ca2 Si8 O24 H2'
_cell_length_a 9.8293
_cell_length_b 18.0307
_cell_length_c 5.2752
_cell_angle_alpha 90
_cell_angle_beta 104.846
_cell_angle_gamma 90
_cell_volume 903.710
_exptl_crystal_density_diffrn      2.985
_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
Mg1   0.00000   0.08775   0.50000   1.00000 ?
Mg2   0.00000   0.17639   0.00000   1.00000 ?
Mg3   0.00000   0.00000   0.00000   1.00000 ?
Ca4   0.00000   0.27822   0.50000   0.50000 ?
Ca4*   0.00000   0.25882   0.50000   0.50000   0.02153
Si1   0.28039   0.08416   0.29742   1.00000 ?
Si2   0.28824   0.17133   0.80493   1.00000 ?
O1   0.11179   0.08596   0.21767   1.00000 ?
O2   0.11860   0.17124   0.72418   1.00000 ?
O3   0.11027   0.00000   0.71599   1.00000 ?
O4   0.36514   0.24820   0.79245   1.00000 ?
O5   0.34644   0.13458   0.10096   1.00000 ?
O6   0.34384   0.11833   0.59009   1.00000 ?
O7   0.33726   0.00000   0.29140   1.00000 ?
H   0.20705   0.00000   0.77993   1.00000   0.02913
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Mg1 0.00329 0.00445 0.00339 0.00000 0.00079 0.00000
Mg2 0.00311 0.00461 0.00381 0.00000 0.00037 0.00000
Mg3 0.00338 0.00379 0.00368 0.00000 0.00039 0.00000
Ca4 0.00448 0.00395 0.00561 0.00000 0.00221 0.00000
Si1 0.00220 0.00395 0.00325 -0.00017 -0.00002 -0.00005
Si2 0.00229 0.00445 0.00337 -0.00009 0.00012 0.00014
O1 0.00348 0.00527 0.00512 0.00035 -0.00025 -0.00065
O2 0.00265 0.00642 0.00576 -0.00009 0.00052 0.00056
O3 0.00352 0.00741 0.00508 0.00000 0.00079 0.00000
O4 0.00521 0.00560 0.00526 -0.00130 0.00079 -0.00005
O5 0.00361 0.00675 0.00524 -0.00035 0.00088 0.00047
O6 0.00434 0.00609 0.00429 0.00000 0.00064 -0.00098
O7 0.00439 0.00461 0.00773 0.00000 0.00106 0.00000