andesine
bichrome andesine of Congo
andesine cabochon with chatoyancy effect type cat’s eye
orange andesine from Congo oval cut
yellow andesine from Congo trillion cut
Detailed sheet
andesine
A feldspar from the family of plagioclases, discovered in 1841 in Marmato in Colombia, is named after its abundant presence in the Andes in South America.
A blood red variety, whose color is due to copper, was discovered in 2002 Congo near the Goma region. Some green-yellow two-tone andesine, also come from Congo.
CHEMICAL CHARACTERISTICS
(Na,Ca)[(Si,Al)4O8]
alumino-silicate calco-sodique
PHYSICAL CHARACTERISTICS
Main color
pink
Other colors
white, grey, colourless, yellow, red, green
Color of streak
white
Luster
vitreous
Hardness
6.0 to 6.5
Density
2.65 to 2.70
Cleavage
perfect
Fracture
uneven
break with very small flat parts
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.542 - 1.563
Double refraction
0.008
very weak, two-axis +/ -
visible double refraction
No
Pleochroism
absent
Number of colors
1
red andesine spectrum system
Fluorescence
none
CRYSTALS PROPERTIES
triclinic crystals well shaped, crosslike macle
crystals system
triclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Colombia, Paraguay, El Salvador, Japan, Russia (Eastern Siberia), and many sites in the United States, Canada, and Europe. The red variety comes from the Democratic Republic of Congo.
use in jewelry
It is cut in facettes and is used in jewelry, especially the well-colored varieties like the red andesine from Congo .
Daily care
and precautions
With a sufficient hardness for jewelry, it can be cleaned with water containing detergent and should be rinsed with limescale-free water and then alcohol.
imitations and
treatments
The andesines do not undergo heat treatment and, to date, are not imitated by synthetic stones.
Historical
healing properties
The andesine were not widely used in crystal healing, nowadays the red variety is being tested by some lithothérapeutes.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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