![pumpellyite from Lake Superior in Michigan in the U.S.](https://www.patrickvoillot.com/wp-content/uploads/2021/03/pumpellyite-lac-superieur-usa.jpg)
pumpellyite
Rare mineral found in the Carriere de la fleche, at Bertrix in the Ardennes, Belgium. We must speak of “pumpellyites” because there are some in which magnesium dominates, in others it is aluminum and yet in others it is iron, as shown here for this