Haüyne (pronounced ah-WEEN) is a rather rare mineral belongs to the sodalite mineral group, which includes sodalite, haüyne, lazurite (a sulfide-bearing haüyne variety), and nosean. Together, these minerals comprise the popular gem rock known as lapis lazuli.
Haüynes have a slightly blueish to colorless streak. Since streak testing can damage or destroy a specimen and most gemstones leave a colorless streak, don't try this test on suspected haüynes.
Excellent intensive blue and gemmy crystal of haüyne in a vug of a sanidinite ejection block.
Colour: Blue, white, grey, ...
Lustre: Vitreous, Greasy
Hardness: 5½ - 6
Locality: In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic complex, Eifel, Rhineland-Palatinate, Germany