certainty of origin : Holotype.
author(s) : Johan
date of publication : 1976
source : Lithos (9) p.165-171
formula : Al2(PO4)(OH)3 H2O
comments about the origin : Mission B.R.G.M. 1974
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP