prehnite
prehnite from Mali with epidote
withe pectolite and green prehnite crystals from Germany
green prehnite from Mali oval cut
Detailed sheet
prehnite
Named in honor of the Dutch collector and Colonel H. Van Prehn who discovered it.
Most prehnites used as gems come from Australia.
CHEMICAL CHARACTERISTICS
CaAl2[Si3O10] (OH)2
calcium alumino -silicate
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
brown, colourless, yellow
Color of streak
white
Luster
pearly, vitreous
Hardness
6.0 to 6.5
Density
2.81 to 2.95
Cleavage
good
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent
Refractive index
1.610 - 1.660
Double refraction
0.020
definite, biaxial positive
visible double refraction
Yes
Pleochroism
absent
Number of colors
1
Absorption spectrum
438
Fluorescence
none
Inclusions
epidote
CRYSTALS PROPERTIES
acicular and tabular, in fibrous -radiated spheres
crystals system
orthorhombic
OTHER INFORMATIONS
Astrological sign
Aries, Scorpio
APPROACHING GEMS
Exploited
sites
It is found in France (Le Bourg d’Oisans, Isère), South Africa, Australia, China, India (Poona), Scotland, United States, China, and Mali associated with epidote.
use in jewelry
It is a popular ornamental stone, it is cabochon cut, satinated in spots . Necklaces of flat beaded are made and small objects.
Sometimes some green prehnite is called “Cape Chrysolite”, this appellation is prohibited.
Daily care
and precautions
sensitive to shocks
Historical
healing properties
With an energizing action at the solar plexus chakra, it would bring gaiety, joy and friendliness. It would be a “facilitative” stone that would undo the accumulated blockages in itself in order to create fluidity. It would act on the circulation of body fluids by facilitating the functioning of organs that are associated.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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