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

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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