5,2mm Kyaniitti, Nepal
Kyaniittii / kyanite
Alkuperä (todennäköinen) : Nepal
Paino ( ct noin ) : 0,6
Mitat ( mm noin ) : 5,2 X 5,2 X 3,3
Hionta : viistehiottu
Puhtaus : VS
Erinomainen Erittäin hyvä Hyvä ”kakkosluokkaa”
Hionta X
Loisto X
Väri X
Ominaista : Kirkas Nepalin Kyaniitti, jossa sähkön siniset loisteet kuin ruiskukan väri
Hakusanat: kyaniitti,jalokivi,kyanite,jalokivi,vvs,brilajntti,sininen
Kyanite is a mineral infrequently cut as a gemstone. It occurs in light to dark blue, green, colorless and brown colors in a transparent form with the blue color being most used in gemstones. Kyanite is of interest because of the extreme variablity in hardness with direction. In one direction, the hardness is 4.5 and in the other it is 7. Very easy cleavage is encountered in one direction with a less perfect cleavage occurring at 74 degrees to the first. The finest gem quality Kyanite may be confused in appearance with spinel or blue sapphires from Burma. |
| Known Facts | |
| Color Key: | Blue, Greenish Blue. |
| Refractive Index:: | 1.716 – 1.731 |
| Chemical Composition: | AL2SIO5 |
| Hardness: | 4.5 – 7.0 |
| Density: | 3.56 – 3.68 |
| Crystal Group: | Triclinic |
| Ocurrence: | Kenya, Nepal, India, Burma,U.S.A. |
