Hauyne

Hauyne is a blue mineral that is extremely rare and was first found on Vesuvius and Mount Somma in 1807 by crystallographer Rene Just Hauy. Hauyne is also called hauynite or '''haüyne. '''Hauyne is a feldspathoid and a member of the sodalite mineral group, along with nosean and sodalite. Hauyne is 2.4-2.5 on the Mohs Hardness Scale