Dear LK

Below is the only ICSD structural data available for C4A3S. The 
reference is :    Saalfeld H, Depmeier W
                            Kristall und Technik,  Vol 7, No. 229     
Hope this is the right one. Just out of interest, do you have any 
references to this compound's use in Portland cement manufacture?


Regards,

Tom Dyer


Concrete Technology Unit
Department of Civil Engineering
University of Dundee
Dundee
DD1 4HN
Scotland
UK  




 Entry Number           3865
 Collection Code        9560


 Cell Data
 ---------

 Dimensions          9.2050(-)        9.2050(-)        9.2050(-)
 Angles              90.000(-)        90.000(-)        90.000(-)
 Measured Density        -
 Volume             779.958
 Z-Value                   2
 Space Group Code   I4-3M
 Space Group No.         217
 Symmetry Information available
 R-Factor (%)          16.20
 Number of Atoms           6

 Atomic Parameters
 -----------------

 Atom       Oxid. Wyck.  Occup.          x               y            
   z

 Ca1         2.0   8C   0.50(0)     0.1700(-)       0.1700(-)     
 0.1700(-)
Ca2         2.0   8C   0.50(0)     0.2410(-)      
 0.2410(-)       0.2410(-)
Al1         3.0  12D     -         0.2500(-)       0.5000(-)       
0.0000(-)
S1          6.0   2A     -         0.0000(-)     0.0000(-)       
0.0000(-)
O1         -2.0  24G     -         0.1630(-)       
0.1630(-)       0.4440(-)
O2         -2.0   8C     -        -0.0790(-)      -0.0790(-)      
-0.0790(-)

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