author(s) : Sahama and Hytonen
date of publication : 1957
source : Min.Soc.Notice No98 Min.Mag.(31) p.503
formula : Na4Ca3Si6O16(OH,F)2
comments about the origin : Sahama 1967
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP