author(s) : Livingstone, Atkin, Hutchinson and Al-Hermezi
date of publication : 1976
source : Min.Mag.(40) p.441-445
formula : H(La,Ce,Th)2 (Ca,La,Na)5 Si16O40
comments about the origin : Livingstone 1974
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP