#hauyne

Haüyne On Fassaite displaying fluorescence

Locality: Biachella Valley, Sacrofano, Rome Province, Lazio, Italy

375 nm (Longwave) UV Light

Hauyne

Locality: Niedermendig Mayen, Eifel, Germany.

Hauyne shares with Lazurite the same chemical formula but with a variation of the sulfide over the sulfate. Hauyne has the sulfate dominating, whereas Lazurite has the sulfide dominating. Much of the known Lazurite material is actually sulfate-dominating, which means it is in fact Hauyne and not Lazurite.  

Reference: [1]

Photo credit: ©Trinity Minerals