johachidolite
johachidolite crystal from Corea
joachidolite from Brazil oval cut
Detailed sheet
johachidolite
It is named after the locality where it was discovered: Johachido District in North Korea. Recent discovery at Mogok in Burma of a variety of beautiful yellow-orange gem quality stones.
CHEMICAL CHARACTERISTICS
CaAl [B3O7]
aluminium and calcium borate mineral
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
white, colourless
Color of streak
white
Luster
vitreous
Hardness
7.5 to 0.0
Density
3.40 to 0.00
Cleavage
none
Fracture
conchoidal
OPTICAL PROPERTIES
Transparency
opaque, translucent, transparent
Refractive index
1.710 - 1.730
Double refraction
0.014
weak, biaxial (+)
visible double refraction
No
Dispersion
++
Pleochroism
absent
Number of colors
1
Fluorescence
strong
blue
CRYSTALS PROPERTIES
very small flattened and dipyramidal crystals
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
The only known deposit that produces a gem quality, that can be cut, is in the region of Mogok in Burma.
use in jewelry
For now it is a collection stone, but its hardness and beautiful color should make it more popular if there were discoveries of bigger stones.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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