euchroite
green crystals of euchroite from Lubietova in Slovakia
Detailed sheet
euchroite
Discovered in 1823, its Greek name means “who has a beautiful color”.
It is found in veins of mica schist.
CHEMICAL CHARACTERISTICS
Cu2(AsO4)OH - 3H2O
copper arsenate hydroxide mineral
PHYSICAL CHARACTERISTICS
Main color
green
Color of streak
green
Luster
vitreous
Hardness
3.5 to 4.0
Density
3.40 to 3.50
Cleavage
indistinct
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.690 - 1.740
Double refraction
0.035
definite, biaxial positive
visible double refraction
No
Dispersion
-
Pleochroism
weak
Number of colors
2
the dark green color makes it difficult to vision dubbing and the colors of pleochroism
Fluorescence
none
CRYSTALS PROPERTIES
small fine crystals
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Slovakia at Lubietova and Poniki, in France at Chessy-les-Mines, in USA at the Sterling Mine in New Jersey, in Montana and Nevada, in Romania in the Banat Mountains, in Czech Republic in Bohemia, in southern Australia, in Asturias in Spain, Italy, in Sardinia in the mines of Montevecchio.
use in jewelry
often dark green, it is a collection stone
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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