author(s) : De Abeledo, Angelelli, De Benyacar and Gordillo
date of publication : 1968
source : Am.Min.(53) p.1
formula : Al2SO4PO4(OH) 9H2O
comments about the origin : Angelelli par Thebault 1974
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP