vivianite
vivanite from Treca in Serbia
staining type inclusions
Detailed sheet
vivianite
Its name honors the British mineralogist J. G. Vivian.
Colorless when fresh, it turns green blue, dark blue or black by partial oxidation of its iron.
The crystals aggregates forming wheels come from Cameroon.
CHEMICAL CHARACTERISTICS
Fe3[PO4]2 8H2O
hydrated iron phosphate
PHYSICAL CHARACTERISTICS
Main color
blue, green
colorless when fresh, it turns green-blue and then black by being oxidized in air
Color of streak
white
Luster
pearly, vitreous
Hardness
1.5 to 2.0
Density
2.60 to 2.70
Cleavage
perfect
Fracture
uneven
cleaves easily into thin strips
OPTICAL PROPERTIES
Transparency
transparent
becomes translucent or opaque by being oxidized
Refractive index
1.560 - 1.640
Double refraction
0.050
strong biaxial (+)
visible double refraction
Yes
Dispersion
-
Pleochroism
strong
Number of colors
3
blue, yellow, green
vivianite spectrum system
Fluorescence
none
Inclusions
fossils
CRYSTALS PROPERTIES
prismatic with predominantly prism and pinacoid, but also in concretions, in crusts, in wheels
crystals system
monoclinic
OTHER INFORMATIONS
Astrological sign
Capricorn, Gemini, Pisces
APPROACHING GEMS
Exploited
sites
It is widespread, being a product of alteration of iron ore, and it is found in France in Commentry (Allier) in Cransac(Cantal), in Cameroon, Namibia, Ukraine, Russia, United States, Japan.
use in jewelry
No use in jewelry, it is too fragile.
It is mainly an ornamental stone and a collectible.
It colors in the blue-green the odontolite when it is heated.
Daily care
and precautions
Keep away from any household product, sensitive to shock, heat …
Historical
healing properties
For healers, it is a very special case, because being transparent it would prove a preferred vehicle of cosmic forces. If it is green under natural light, you would use it at the Heart Chakra to release all the accumulated energy.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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