certainty of origin : Holotype.
author(s) : Gaudefroy, Granger, Permingeat and Protas
date of publication : 1968
source : Bull.Soc.Fr.Min.Crist.(91) p.43-50
formula : Ca3Mn(SO4)2 (OH)6 3H2O
comments about the origin : Permingeat 1963
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP