gadolinite
gadolinite crystal from Iveland in Norway
Detailed sheet
gadolinite
Appointed in 1800 in honor of the Finnish mineralogist Johan Gadolin (1760-1852) who isolated the Yttrium element in 1797. This rare earth is used to imitate the diamond, synthetic zirconia oxide, to stabilize it in a cubic form at atmosphere temperature. Gadolinium is one of the elements of “GGG” (Gadolinium, Gallium, Garnet), another imitation of the diamond. This is a rare stone.
CHEMICAL CHARACTERISTICS
Y2FeBe2[Si2O10]
beryllium, iron, yttrium silicate mineral
PHYSICAL CHARACTERISTICS
Main color
black
Other colors
brown, green
Color of streak
grey, green
Luster
greasy, vitreous
Hardness
6.5 to 7.0
Density
4.00 to 4.65
Cleavage
none
Fracture
uneven
the fracture presents some micro-cleavages likes in strips
OPTICAL PROPERTIES
Transparency
opaque, translucent
rarely translucide
Refractive index
1.770 - 1.840
Double refraction
0.050
definite, biaxial positive
visible double refraction
No
Dispersion
+
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
massive agregates
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in the isle of Elba in Italy, Switzerland, Scotland, Sweden, United States (Colorado, Arizona, Washington), China, Mongolia, Kazakhstan, Burma.
use in jewelry
it is faceted for collection
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo consectetur adipiscing elit. Ut elit tellus, luctus nec.
