(pronounced "how-een") is an extremely rare mineral and even rarer
gemstone. It was first described, mineralogically in 1807 by Renť Hauy
from who it derived its name. Examples of haŁyne 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 HaŁyne 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