author(s) : Sarp, Bertrand and Mc Near
date of publication : 1976
source : Am.Min.(61) p.825
formula : CaAlSiO4(OH)
comments about the origin : Sarp par Deferne 1979
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP