certainty of origin : Donated directly by the Author.
author(s) : Damour
date of publication : 1856
source : Ann. des Mines (10) p.65
formula : phosphorite (?)
comments about the origin : coll.Adam No4386 obtenu par Damour en 1857
catalog number(s) : 17444
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP