author(s) : Shepard
date of publication : 1870
source : Rural Carolinian, (1)p.470
formula : NH4H2PO4
comments about the origin : Etiquette Bertrand coll. Adam No4327 et 4334, envoi de Shepard 1876
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP