

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
Venez visitez
notre site web
voillot-joaillier.fr
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