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[ Last edited by ghcacj on 2011-9-27 at 09:31 ]
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dujuan247(½ð±Ò+20): лл 2011-09-27 09:53:36
dujuan247(½ð±Ò+10): 2011-12-27 16:28:29
ÒýÓûØÌû:
1Â¥: Originally posted by dujuan247 at 2011-09-27 09:05:12:
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[ Last edited by ghcacj on 2011-9-27 at 09:31 ]

There is also a trihydrate, MgCO3.3H2O (rhombic; r.d. 1.85), which occurs naturally as nesquehonite


Mg(OH)2 : brucite

2Â¥2011-09-27 09:36:44
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dujuan247

Í­³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by taochn at 2011-09-27 09:36:44:
There is also a trihydrate, MgCO3.3H2O (rhombic; r.d. 1.85), which occurs naturally as nesquehonite


Mg(OH)2 : brucite

[eimg]12/72/287346_1317087 ...

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3Â¥2011-09-27 09:53:19
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dujuan247

Í­³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by taochn at 2011-09-27 09:36:44:
There is also a trihydrate, MgCO3.3H2O (rhombic; r.d. 1.85), which occurs naturally as nesquehonite


Mg(OH)2 : brucite

[eimg]12/72/287346_1317087 ...

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4Â¥2011-09-27 10:19:55
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taochn

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ghcacj(½ð±Ò+5): лл 2011-09-28 09:41:12
Nesquehonite Crystallography
Axial Ratios:  a:b:c =2.2263:1:1.4248  
Cell Dimensions:  a = 12, b = 5.39, c = 7.68, Z = 4; beta = 90.45¡ã V = 496.73 Den(Calc)= 1.85  
Crystal System:  Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n  
X Ray Diffraction:  By Intensity(I/Io): 6.5(1), 3.86(0.9), 2.61(0.7),
5Â¥2011-09-27 10:55:16
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ghcacj(½ð±Ò+6): лл 2011-09-28 09:41:53
dujuan247(½ð±Ò+10): 2011-12-27 16:28:40
cifÎı¾ÈçÏÂ
data_global
_chemical_name_mineral 'Nesquehonite'
loop_
_publ_author_name
'Stephan G W'
'MacGillavry C H'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 28
_journal_year 1972
_journal_page_first 1031
_journal_page_last 1033
_publ_section_title
;
The crystal structure of nesquehonite, MgCO3*3H2O
;
_database_code_amcsd 0009432
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Mg C O6 H6'
_cell_length_a 7.7053
_cell_length_b 5.3673
_cell_length_c 12.1212
_cell_angle_alpha 90
_cell_angle_beta 90.451
_cell_angle_gamma 90
_cell_volume 501.277
_exptl_crystal_density_diffrn      1.833
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Mg   0.25174   0.08872   0.15050
C   0.24393   0.13607   0.40940
O1   0.26062   0.40719   0.06257
O2   0.24408   0.20582   0.30895
O3   0.25134   0.81598   0.02076
Wat1   0.52473   0.09140   0.15257
Wat2   0.98257   0.09667   0.14691
Wat3   0.27989   0.34792   0.83847
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
Mg 0.01483 0.01912 0.01764 -0.00048 0.00355 -0.00077
C 0.01299 0.03522 0.01623 -0.00001 0.00035 -0.00119
O1 0.03729 0.01223 0.03379 0.00307 0.00646 -0.00073
O2 0.02247 0.01617 0.02397 -0.00083 0.00837 -0.00308
O3 0.02499 0.02789 0.01868 -0.00102 0.00144 -0.00124
Wat1 0.01417 0.04702 0.03059 -0.00240 0.00719 -0.00161
Wat2 0.01784 0.06188 0.02367 0.00269 0.00106 0.00008
Wat3 0.04295 0.03818 0.02776 0.00163 0.00776 0.00201
6Â¥2011-09-27 11:02:14
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dujuan247

Í­³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
6Â¥: Originally posted by taochn at 2011-09-27 11:02:14:
cifÎı¾ÈçÏÂ
data_global
_chemical_name_mineral 'Nesquehonite'
loop_
_publ_author_name
'Stephan G W'
'MacGillavry C H'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume  ...

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7Â¥2011-09-27 11:15:42
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ghcacj(½ð±Ò+5, Ä£ÄâEPI+1): лл 2011-09-28 09:41:43
dujuan247(½ð±Ò+10): 2011-12-27 16:28:46
ÒýÓûØÌû:
7Â¥: Originally posted by dujuan247 at 2011-09-27 11:15:42:
Õâ¸öÎÒ¿´²»¶®£¬²»ÊǸãÄ£ÄâµÄ£¬ÎÄÏ×ÖÐÄ£Äâ³öµÄ·ÖÎö½á¹¹Í¼£¬ºÍÄãµÄ½á¹û²»Ì«Ò»Ñù£¬Âé·³¿´¿´ÊÇʲôԭÒò£¿¿É·ñ°ÑQQ¸æÎÒһϣ¬±È½Ï¼±£¡£¡

http://wenku.baidu.com/view/37e1ddf0f90f76c661371a32.html


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8Â¥2011-09-27 11:23:16
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9Â¥2011-09-27 11:26:01
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dujuan247

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dujuan247: »ØÌûÖö¥ 2012-03-18 20:52:17
ÒýÓûØÌû:
9Â¥: Originally posted by taochn at 2011-09-27 11:26:01:
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