Skip to content
Hau night
Hauinite has an impressive bright cobalt blue color.
It is also known as one of the minerals that make up lapis lazuli.
Because its production areas are limited and large grains are difficult to harvest, it is highly valued as a rarity.
Some of them even fluoresce under ultraviolet light.
Karatz GemMagazine
" Aui Night "
Karatz GemMagazine
" Aui Night "
This gemstone is popular for its neon blue and cobalt blue hues.
Because they are produced in limited areas and are often small in size, they are valued as rare items.
| English name | Haüyne, Hauynite |
| Japanese name | Indigo stone, indigo gemstone |
| crystal system | equiaxed crystal system |
| chemical composition formula | (Na,Ca) 4-8 Al 6 Si 6 (O,S) 24 (SO 4 ,Cl) 1-2 |
| mohs hardness | 5.5-6 |
| specific gravity | 2.44 - 2.50 |
| refractive index | 1.49 - 1.51 |
| luster | Glass luster to oil luster |
The main colors are neon blue and cobalt blue.
Inside: ●Those with deep and vivid colors ●Things with high transparency without inclusions, scratches, or chips ●Things with beautiful cuts ●The larger the size, the higher the value.
In particular, it is difficult to harvest large-sized ouinite, so the price of items larger than 1 ct tends to rise significantly.
The Eifel region of Germany is known for producing gem-quality auinite.
It is said to have been named after René Just Haüy, a famous French mineralogist.