>Below is the only ICSD structural data available for C4A3S. The 
>reference is :    Saalfeld H, Depmeier W
>                            Kristall und Technik,  Vol 7, No. 229     

Actually there are a couple more in ICSD (http://barns.ill.fr/dif/icsd/)
including a more recent one done with Rietveld refinement :-)

Saalfeld,H. Depmeier,W. (1972) Krist.Tech. 7 229-233 
Silicon-Free Compounds with Sodalite Structure 

Kondo,R. (1965) Journal of the Ceramic Association of Japan 73 1-8 
The Synthesis and Crystallography of a Group of New Compounds Belonging to the
Hauyne Type Structure 

Calos,NJ. Kennard,CHL. Whittaker,AK. Davis,RL. (1995) J.Solid State Chem. 119 1-7 
Structure of calcium aluminate sulfate Ca4 Al6 O16 S


Alan Hewat, ILL Grenoble, FRANCE <[EMAIL PROTECTED]> tel (33) 4.76.20.72.13 
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