ardennite
noun
ar·den·nite
ärˈdeˌnīt
plural -s
: a mineral Mn5Al5(VO4)(SiO4)5(OH)2·2H2O consisting of a hydrous silicate vanadate and arsenate of manganese and aluminum
Word History
Etymology
German ardennit, from Ardennes region, Belgium, its locality + German -it -ite