Montmorillonite cif

[Chrysochoou, Maria]

Hi,
 
does anyone have a freely available structure file for montmorillonite (any 
hydration state)? Also, what is a reasonable Reference Intensity Ratio for it? 
The only ICSD entry has an RIR of over 23, so does vermiculite. Why is that so 
high?
 
Thank you,
Maria Chrysochoou