author(s) : Williams
date of publication : 1976
source : Am.Min.(61) p.1255
formula : CaZn2Si2O7H2O
comments about the origin : 1) etiquette Sorbonne ech. Williams par Sorbonne 1979 (cotype). 2) Williams 1979 (auteur)
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP