A very rich, fine, and nearly solid dark gray ore specimen of the rare natural alloy stibarsen (allemontite is an old synonym for this alloy) allemontite from the Type Locality - Allemont, France. Allemontite is a variable composition of arsenic and antimony. Comes with an old, faded, expertly handwritten label. The collection this came out of was a museum stash dating to prior to World War I.