jeremejevite
jeremejevite from Namibia fancy cut
blue jeremejevite from Namibia pear cut
solid and liquid like inclusions
color like inclusion
Detailed sheet
jeremejevite
It honors the Russian mineralogist Pavel Vladimirovich Jeremejev (1830-1899) who has identified it in 1883 in Siberia.
CHEMICAL CHARACTERISTICS
Al6[BO3]5(F,OH)3
aluminium borate mineral
PHYSICAL CHARACTERISTICS
Main color
blue
Other colors
white, blue, colourless, yellow
Color of streak
white
Luster
vitreous
Hardness
6.5 to 7.5
Density
3.26 to 3.32
Cleavage
none
Fracture
conchoidal
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.636 - 1.654
Double refraction
0.007
weak uniaxial negative
visible double refraction
No
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
elongated prismatic
crystals system
hexagonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in the Erongo Region at Arandis in Namibia, country from which the finest stones in gem quality, of a blue color, come from.
But also in Madagascar, in larger crystals, but less colored, in Tajikistan, also in larger crystals but not transparent and brown or yellow, and in historical deposits: in Germany (Eifel Mountains in the Palatinate), and Russia in eastern Siberia.
use in jewelry
Very rare because its crystal gems are always very small, it is cut in facets, also baguette, from its elongated blue crystals coming from Namibia. This is a collection stone but its hardness and strength, make it usable in jewelry if big gem crystals were discovered.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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