Description
Remarkable small automorphic crystal of mispickel or arsenopyrite from the Semnon mine at Martigné Ferchaud in the Ille et Vilaine department of Brittany.
The Semnon mine, in the commune of Martigné Ferchaud, was mined in the 19th and 20th centuries for the production of antimony.
This post is also available in: French