AM_Epistilbite Formula: Ca.333 Na.038 K.024 (Al.768 Si2.232) O8 H2.38 Name: Epistilbite Unit cell: 9.083 17.738 10.209 89.95 124.58 90.0 , V=1354.23 Space group: C1 (1)

Yang P , Armbruster T , European Journal of Mineralogy , 8 (1996) p.263-271, (010) disorder, partial Si,Al ordering, and Ca distribution, in triclinic (C1) epistilbite, Sample: 293 K, Locality: Gibelsbach, Fiesch (Valais, Switzerland)