durangite
CHEMICAL CHARACTERISTICS
NaAl[AsO4]F
aluminium arsenate fluoride
PHYSICAL CHARACTERISTICS
Main color
orange
Other colors
yellow, red, green
Color of streak
yellow
Luster
vitreous
Hardness
5.0 to 5.5
Density
3.94 to 4.08
Cleavage
good
Fracture
uneven
cleavage only on one axe
OPTICAL PROPERTIES
Transparency
translucent
Refractive index
1.634 - 1.685
Double refraction
0.050
definite, biaxial (-)
visible double refraction
No
Dispersion
stark
Pleochroism
definite
Number of colors
2
colorless orange
Fluorescence
none
CRYSTALS PROPERTIES
prismatic
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Lunenburg County – Nova Scotia, Canada, Cornwall, England and of course in Durango, Mexico.
use in jewelry
cut in facets it’s a nice collection stone with a very nice orange color
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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