kornerupine
komerupine from Sri Lanka with chatoyancy
kornerupine crystal from Barakela in Madagascar
African kornerupine emerald cut with inclusions
solid like inclusions
parallel growth tubes – type inclusion
Detailed sheet
kornerupine
Mineral honoring the young Danish geologist Andreas N. Kornerup (1857-1881) who discovered it in Greenland. Sometimes it can present a speckle of the type “cat eye”. Often brown and dark, beautiful yellow-green varieties are from Sri Lanka and it has now been discovered in emerald green colored varieties in Asia and in a light blue color (Tanzania and Sri Lanka).
CHEMICAL CHARACTERISTICS
Mg3Al6(Si,Al,B)5O21 (OH)
aluminum magnesium borosilicate
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
blue, brown, colourless, yellow, mauve, pink, purple
Color of streak
white
Luster
greasy, vitreous
Hardness
6.5 to 7.0
Density
3.26 to 3.45
Cleavage
good
Fracture
conchoidal
easy cleavage
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.660 - 1.700
Double refraction
0.011
weak biaxial (-)
visible double refraction
No
Dispersion
0.018(0.010)
Pleochroism
strong
Number of colors
3
green, yellow, reddish brown
Absorption spectrum
503 - 446
brown - green kornerupine spectrum system
Fluorescence
variable
rare yellow fluorescence
CRYSTALS PROPERTIES
elongated prisms in columnar aggregates or radiant
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Greenland, South Africa, Burma, Canada, Kenya, Madagascar, Sri Lanka, Tanzania, Pakistan, Vietnam.
use in jewelry
The clear crystals are collection stones, it is cut in facets, it’s kind of resistant
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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