AM_Cs9Al9Si27O72_13H2O
Formula: Cs4.16 Ca.2 (Si13.66 Al4.34) O42.35 H30
Name: Cs9Al9Si27O72*13H2O
Unit cell: 17.76 18.095 7.428 89.91 115.93 90.18 , V=2146.79
Space group: C-1 (2)

Yang P , Armbruster T , Journal of Solid State Chemistry , 123 (1996) p.140-149, Na, K, Rb and Cs exchange in heulandite single-crystals: X-ray structure, refinements at 100 K, Sample: T = 100 K, Locality: Nasik, India