1.25" Vibrant Blue Hauyne with Sanidine and Augite - Germany

Hauyne or haüyne, also called hauynite or haüynite (old name Azure spar), is a rare tectosilicate sulfate mineral. It is a feldspathoid and a member of the sodalite group. Hauyne was first described in 1807 from samples discovered in Vesuvian lavas in Monte Somma, Italy, and was named in 1807 by Brunn-Neergard for the French crystallographer René Just Haüy. In the Eifel Mountains of Germany, hauyne forms in a magma chamber along with sanidine, a potassium feldspar mineral that's also quite uncommon. The vibrant blue color of the hauyne from these deposits contrasts nicely against the white-colorless sanidine-rich matrix.