Hauyne
  Haüyne (pronounced "how-een") is an extremely rare mineral and even rarer gemstone. It was first described, mineralogically in 1807 by René Hauy from who it derived its name. Examples of haüyne are found in association with alkaline volcanic rocks that are primarily located vicinity of Laacher See Eifel Mountain district of Germany. The highest prized specimens of Haüyne found in this locality are of an unusual vibrant blue colour. Lighter blue to greenish blue colors are found as well. Gem quality material has not been reported from other localities.  
 

Location - Germany

  
Group - Silicate R.I. - 1.494 - 1.509 Hardness - 5.5-6
 

 

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