sogdianite
sogdianite from Kalahari in South Africa
Detailed sheet
sogdianite
Discovered in 1968 in Tajikistan, it owes its name to Sogdiana, who is the former name of this Central Asian region.
CHEMICAL CHARACTERISTICS
(K,Na)2(Li,Fe,Al)3Zr[Si12O30]
complex cyclosilicate
PHYSICAL CHARACTERISTICS
Main color
purple
Color of streak
white
Luster
vitreous
Hardness
7.0 to 0.0
Density
2.90 to 0.00
Cleavage
perfect
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.610 - 1.630
Double refraction
0.002
very weak, uniaxial (-)
visible double refraction
No
Pleochroism
absent
Absorption spectrum
437 - 419 - 411
Fluorescence
none
CRYSTALS PROPERTIES
flattened short prisms
crystals system
hexagonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in the Tien Shan Mountains in Tajikistan and in the United States in Washington State, in the Okanogan County.
use in jewelry
it is only a collection stone
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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